143 results about "Digital Light Processing" patented technology

The invention provides a patterned reinforcing material 3D printing method and system based on an acoustic manipulation technology, relates to the combination of the acoustic manipulation technology and a digital light processing (DLP) technology, and is used for manufacturing a composite material sample piece containing patterned reinforcing filler distribution. According to the technology, a three-dimensional model is designed through computer aided design software, plane ultrasonic waves are converted into a specific three-dimensional sound field through a digital acoustic hologram, and accurate control over reinforcing filler in photosensitive resin is achieved. The acoustic control system controls the distribution of the reinforcing filler, and the DLP projector is used for curing the composite material layer by layer. The method allows the digital acoustic hologram to be adjusted in real time so as to adapt to different reinforcing filler patterning assembly and reinforcing requirements. According to the technical scheme, the control capability of 3D printing on reinforcing filler distribution is improved, and the application field of the composite material is widened.

The invention provides a three-dimensional printing method and device and a three-dimensional printing data processing method and device, and relates to the technical field of three-dimensional printing. The three-dimensional printing data processing method for digital light processing printing comprises the steps that three-dimensional data of an object to be printed are obtained, and the three-dimensional data comprise the positions of interfaces of different printing materials needed by the object to be printed; a diffusion structure is generated at the position of the interface, the diffusion structure is used for diffusing the printing material used later at the position of the printing interface in the diffusion structure, and the printing material corresponding to the diffusion structure is the printing material used first at the position of the printing interface; and generating three-dimensional printing data according to the three-dimensional data and the diffusion structure.

The invention relates to a cartilage organ constructed on the basis of a DNA-silk fibroin hybrid hydrogel sustained-release system as well as a preparation method and application of the cartilage organ. The DNA-silk fibroin hybrid hydrogel sustained-release system is a hydrogel system formed by printing a DNA-silk fibroin hybrid hydrogel sustained-release system premix solution through a digital light processing system, and the DNA-silk fibroin hybrid hydrogel sustained-release system premix solution contains DNA, silk fibroin, acryloylated RGD peptide, acryloylated polyethylene glycol NHS ester, glucosamine, TD-198946 and 2, 4, 6-trimethyl-1, 3-pentanediol. The invention discloses a lithium 2, 6-trimethylbenzoyl phosphate. Compared with the prior art, the glucosamine and the TD-198946 introduced into the DNA-silk fibroin hybrid hydrogel sustained-release system disclosed by the invention can be used for remarkably improving and promoting the cartilage differentiation efficiency of the bone marrow mesenchymal stem cells; the cartilage graft can be transplanted to a cartilage defect position as a cartilage graft to promote cartilage regeneration and repair.

The invention discloses a digital light processing printing control method based on temperature control microsphere bio-ink. Comprising the following steps: firstly, constructing a constitutive model of the three-phase conversion bio-ink according to melting conditions of dispersed phase microspheres in the three-phase conversion bio-ink at different printing temperatures and steady-state shear stress-shear rate curves at different printing temperatures; fitting is carried out by using the constitutive model and data in the steady-state shear stress-shear rate curve at different printing temperatures, and reconstruction coefficients and first damage coefficients corresponding to different printing temperatures are obtained; and finally, whether the three-phase conversion bio-ink has the forming capacity of the dynamic support bath at different printing temperatures or not is determined, so that the proper printing temperature is determined, and DLP printing is carried out. Proper bio-ink can be prepared according to actual bio-printing requirements, the optimal printing temperature is obtained, and accurate control over printing conditions is achieved.

Methods for calibrating a digital light processing additive manufacturing system. A method for scale factor calibration comprises: projecting calibration images of a calibration pattern by varying a projector's scaling factor; Capturing and analyzing the calibration images to determine dimensional attributes of the projected calibration pattern; Computing a calibration model fitting a relationship between the scaling factor and dimensional accuracy of the projector based on said dimensional attributes; Identifying a scaling factor where dimensional accuracy is optimal. A method for calibrating uniformity comprises: projecting a uniform pattern; capturing and analyzing a uniformity calibration image of said uniform pattern to determine a calibration intensity distribution of calibration image pixels; computing a correction map, wherein each correction map pixel is associated with a correction intensity determined using a tunable calibration factor and a calibration intensity of a corresponding calibration image pixel, wherein said tunable calibration factor depends on the calibration intensity distribution.

The present application relates to a vehicle light control system, and provides a vehicle exterior decorative light control system, comprising a digital light control unit electrically connected to an exterior decorative light unit. The digital light control unit comprises a light editing module and a digital light processing module; the light editing module provides a visual light editing interface corresponding to a vehicle styling arrangement, and exterior decorative light information that can be customized is formed in the visual light editing interface, the exterior decorative light information comprising projection headlamp brightness information, interactive signal lamp pixel information and surrounding projection lamp brightness information; the digital light processing module is in communication connection with the light editing module, so as to convert the exterior decorative light information into a lighting description file and transmit the lighting description file to the exterior decorative light unit for display control. Therefore, the present application achieves unified control of exterior decorative lamps, thus ensuring precise synchronization during exterior decorative light display; and the present application supports customized lamp light effects, thus achieving fully personalized welcome effects. The present application further provides a vehicle welcome control method and a vehicle.

The invention provides a digital light processing 3D printing column array pore channel ceramic membrane for zinc-based flow batteries (ZFBs), and belongs to the technical field of flow batteries. According to the flow battery diaphragm disclosed by the invention, the 3D printed ceramic membrane is used as a substrate, and the ultrathin sub-hydrophilic polyelectrolyte selection layer is prepared on the surface of the ceramic membrane, so that rapid ion transmission is realized, and zinc deposition is effectively regulated and controlled. Due to the existence of the 3D printed column array pore channels, the ion transmission path is effectively shortened, the membrane contact resistance is reduced, rich three-dimensional space in the pore channels can be used for zinc deposition and electrolyte storage, and the area capacity of the battery is effectively improved. And the mechanical firmness of the ceramic can resist structural damage caused by zinc dendrites, so that the battery can stably run for a long time.

The invention provides an image correction processing method and system for a vehicle-mounted ground projection system. The method comprises the following steps: S1, acquiring a current motor rotation angle and a vehicle front distance of a selected ground projection area; s2, calculating four angular points of a target image according to the current motor rotation angle and the vehicle front distance of the selected ground projection area; s3, calculating a transformation matrix of a corrected image according to the four corners of the original image and the four corners of the target image, and correcting the original image to obtain the target image; and S4, transmitting the target image data to a DLP (Digital Light Processing) for projection. According to the invention, the image deformation problem in the vehicle-mounted ground projection process can be corrected in real time by combining the rotation angle of the motor and the selected front distance of the ground projection area in front of the vehicle; it is ensured that no matter how the vehicle moves or the projection angle is adjusted, the projected image can be kept clear and does not deform, and the visual experience of a user is greatly improved.

The invention relates to the technical field of dead pixel detection and compensation of a digital light processing projection system, in particular to a DLP dead pixel calibration and compensation method and system based on a Transform attention mechanism. According to the DLP dead pixel calibration and compensation method based on the Transform attention mechanism, a multi-scale feature pyramid is constructed, global features are extracted by using a layered multi-mode Transform encoder, and a dead pixel confidence coefficient heat map is generated in combination with a dynamic sparse mask multi-head attention mechanism; dynamically selecting compensation strategies for different types of dead pixels by adopting a dead pixel type-scene demand dual-drive time-space domain compensation pipeline; ambient light and partition temperature sensor data are integrated, and the influence of optical crosstalk and thermal drift is eliminated through a brightness adaptive calibration function; and finally, carrying out closed-loop verification and iterative optimization by adopting a loss function fused with HVS perception loss. According to the method, the defective pixel detection precision is improved from 82.3% to 99.2%, the PSNR after compensation is improved from 32.6 dB to 42.5 dB, the processing delay is reduced to 7ms / frame, and the visual quality and reliability of a DLP system are improved.

A method of manufacturing customized ceramic labial / lingual orthodontic brackets by digital light processing, said method comprises measuring dentition data of a profile of teeth of a patient, wherein measuring dentition data is performed using a CT scanner or intra-oral scanner, based on the dentition data, creating a three dimensional computer-assisted design (3D CAD) model of the patient's teeth using reverse engineering, and saving the 3D CAD model on a computer, designing a 3D CAD bracket structure model for a single labial or lingual bracket structure, importing the 3D CAD bracket structure model into a Digital Light Processing (DLP) machine, directly producing the bracket by layer manufacturing.

The application relates to a cartilage organoid based on a DNA-silk fibroin hybrid hydrogel sustained-release system and a preparation method and application thereof. The DNA-silk fibroin hybrid hydrogel sustained-release system is a hydrogel system after a DNA-silk fibroin hybrid hydrogel sustained-release system premixing solution is printed through a digital light processing system, wherein the DNA-silk fibroin hybrid hydrogel sustained-release system premixing solution contains DNA, silk fibroin, acrylated RGD peptide, acrylated polyethylene glycol NHS ester, glucosamine, TD-198946 and 2,4,6-trimethylbenzoyl lithium phosphate. Compared with the prior art, the glucosamine and TD-198946 introduced in the DNA-silk fibroin hybrid hydrogel sustained-release system can significantly improve the cartilage differentiation efficiency of bone marrow mesenchymal stem cells; and the application can be transplanted to a cartilage defect as a cartilage graft to promote cartilage regeneration and repair.

The embodiment of the invention discloses a personalized ear mold integrated manufacturing method based on multi-material digital light processing, and relates to the technical field of additive manufacturing. The method comprises the following steps: acquiring a personalized ear mold three-dimensional numerical model of a specific patient; adding a static load based on the dead weight of the hearing aid and a dynamic load based on the periodic force of the chewing motion to the numerical model, and performing dynamic stress analysis on the numerical model based on the added loads; based on a stress analysis result, dividing material areas with different hardness in the numerical model, including a rigid supporting area, a flexible sealing area and a transition area; according to the stress gradient line, the volume fraction of the rigid material and the volume fraction of the flexible material used for DLP three-dimensional printing at all positions in the transition area are determined; and according to the volume fraction and the printing energy density of the rigid supporting area and the printing energy density of the flexible sealing area, the printing energy density of all the positions in the transition area is determined. According to the embodiment, the manufacturing quality and efficiency of the ear mold can be improved.

The invention provides light-cured bio-ink, a digital light processing 3D printing product, a preparation method of the digital light processing 3D printing product and application of the digital light processing 3D printing product in preparation of a skull repair material, and belongs to the technical field of biological medicine. The material provided by the invention can continuously release HO under different environmental conditions. Particularly, in a simulated in-vivo environment, the GHDP hydrogel keeps stable HO release for a long time, so that a signal channel related to angiogenesis is continuously activated, and in the skull defect repair process, the GHDP hydrogel can promote neovascularization and osteogenic differentiation by regulating and controlling the HO level, so that the skull defect repair effect is improved. And a new strategy and thought are provided for promoting tissue regeneration by utilizing redox signal regulation and control.

The invention relates to a structured light imaging system suitable for semiconductor SIP system-in-package, which comprises a central camera, and a plurality of groups of DLP projections and side cameras are symmetrically arranged on two sides of an optical axis of the central camera; the DLP projector emits parallel light beams to irradiate the surfaces of the crystal grains, and the side cameras receive reflected light rays in parallel; the device further comprises a control unit, and the control unit sequentially controls the DLP projectors and the side cameras which are symmetrically arranged in pairs to synchronously work and processes image data so as to reconstruct the three-dimensional morphology of the surface of the crystal grain. When incident light emitted by the DLP projector irradiates the surface of the crystal grain at a specific angle, specular reflection light of the incident light propagates in the symmetrical direction according to the reflection law. The side camera and the DLP projector are symmetrically arranged, so that the optical axis of the side camera is consistent with a reflection light path, and a highlight area image generated by mirror reflection is accurately captured. The layout breaks through the limitation of the traditional diffuse reflection hypothesis, so that the morphology information of the high-reflection surface can be completely acquired, and the accuracy and reliability of crystal grain three-dimensional reconstruction in SIP packaging are remarkably improved.

Disclosed in the present invention are a multi-cell digital light processing printer and printing method based on "light field-magnetic field" coupling control. According to the present invention, a magnetic field generating device is coupled to a stereolithography device, and a magnetic field is used for controlling material change of microspheres carrying different cells and having different magnetic contents in a container, so that the material change process and the printing process are carried out in parallel, thereby improving the printing efficiency; and a single container is used for contactless material change, so that cross contamination is reduced, and a multi-cell biological structure can be manufactured in a high-precision, high-efficiency and high-cell-viability manner.

The invention provides a method for constructing a multi-phase multi-material structure through DLP3D printing and SLS laser selective sintering. The method comprises the steps that 1, materials are prepared; photosensitive resin is used as a matrix, a ceramic precursor, a metal particle precursor and a functional resin mixed material suitable for photocuring 3D printing are prepared, and it is ensured that the viscosity, rheological property and stability of all materials meet the photocuring printing requirement. And 2, carrying out photocuring 3D printing. Step 2, the multiple kinds of slurry in the step 1 are sequentially loaded into an independent special material groove of 3D printing equipment, layer-by-layer curing printing is conducted through the digital light processing technology according to preset three-dimensional model geometric information, and in the printing process, different materials are deposited to a designated area according to the design layout by adjusting the printing sequence and the light source position. The invention provides a new possibility for manufacturing a complex and multifunctional composite structure.

The invention discloses an ultra-large octave antenna based on an organic photoconductive material, and belongs to the field of metamaterials and antennas. Comprising an organic photoconductor film electromagnetic surface and a digital light processing module capable of projecting different patterns on the surface of the organic photoconductor film electromagnetic surface, the organic photoconductor film electromagnetic surface can change conductivity distribution through light control, and the digital light processing module can dynamically adjust the size and shape of the patterns projected on the organic photoconductor film electromagnetic surface. Therefore, a reconfigurable antenna array is generated, and cross-multi-octave ultra-wideband electromagnetic wave signal receiving and transmitting are realized. The electromagnetic surface of the organic photoconductor film sequentially comprises a photoconductive material layer, a first light-transmitting glass layer, an indium tin oxide microstrip line feed layer, a second light-transmitting glass layer and a substrate indium tin oxide layer according to a lamination sequence. According to the invention, the problems of narrow bandwidth, slow response and high cost of a traditional reconfigurable antenna are solved.

A resin for grayscale digital light processing 3D printing includes a donor moiety, an acceptor moiety, a rigid moiety, a photoinitiator, and a photoabsorber. The donor moiety is an acrylate monomer with a side group of a free carbonyl, a primary amine on an acrylate, a secondary amine on an acrylate, and / or a tertiary amine on an acrylate. The acceptor moiety is different than the donor moiety and is an acrylate monomer with a side group of a free hydroxy, a primary amine, secondary amine, and / or an imine. And the rigid moiety is acrylate monomer with a side group of a cyclohexyl, a substituted cyclohexyl, or a bicyclic structure. A monolithic structure formed from the resin using grayscale digital light processing 3D printing can have a Young's modulus ranging from 0.1 MPa to 100 MPa.

The invention discloses a circuit board system and laser projection equipment, and belongs to the field of laser projection. The invention provides a circuit board system. The circuit board system comprises a power panel, a light source driving module and a control module, the control module comprises a first circuit board, a first control circuit and a digital light processing DLP chip, and the first circuit board and the power panel are separately arranged; the light source driving module comprises a second circuit board and a laser. The DLP chip and the DMD light valve are both located on the first circuit board in the control module, and it can be guaranteed that the probability that the control signal sent by the DLP is interfered is low. And when the form of the laser in the laser projection equipment needs to be replaced, only the light source driving module needs to be replaced, so that the research and development cost and the production cost of the laser projection equipment can be reduced.

The application relates to the field of high polymer composite materials and packaging, and discloses a preparation process of an automobile hub bearing blister tray, which comprises the following steps: functional slurry containing the prepolymer and microcapsules is coated to form a film; a programmable energy field such as digital light processing is used to differentially irradiate the liquid film, in-situ polymerization is carried out to form a gel state semi-finished product with a high-strength bearing area and a high-flexibility buckle area; and then vacuum blister forming is carried out. The application integrates material polymerization and three-dimensional forming into one, shortens the production cycle, and reduces the energy consumption generated by traditional secondary heating forming; through composite functional microcapsules and construction of mechanical property gradients, the tray has composite functions such as active corrosion inhibition, damage self-repair and state indication, meanwhile, the tray realizes accurate matching of material performance and local functional requirements, and improves the utilization efficiency of the material and the overall reliability of the structure.

The invention relates to the technical field of medical instrument simulation and testing, in particular to a high-precision 3D printing personalized alimentary canal entity model method which comprises the steps that alimentary canal CT image data covering the range from the nasal cavity to the jejunum of a target individual and biomechanical property reference data of different sections of the alimentary canal are obtained; generating a stiffness distribution diagram; transparent flexible photosensitive resin is used as a base material, and various transparent flexible photosensitive resin materials with different elastic moduli are prepared by adding a modifier; generating a printing instruction; a digital light processing 3D printer is adopted, a solid model is printed layer by layer according to a printing instruction, the distributed transparent flexible photosensitive resin material is automatically switched and used in the printing process, and exposure parameters of ultraviolet light are dynamically adjusted based on the characteristics of the currently used transparent flexible photosensitive resin material so as to control the post-curing elastic modulus of different sections. Through accurate elastic modulus control and dynamic exposure adjustment, the mechanical properties of different sections of the digestive tract are highly consistent with the actual situation.

In one or more embodiments, the present invention provides a low molecular weight, non-toxic, resorbable poly(ethylene glycol) (PEG)-block-poly(propylene fumarate) (PPF) diblock copolymers and poly(propylene fumarate) (PPF)-block-poly(ethylene glycol) (PEG)-block-poly(propylene fumarate) (PPF) triblock copolymers (and related methods for their making and use) that permits hydration for the formation of such things as hydrogels and has constrained and predictable material properties suitable for 3D printing and drug delivery applications. Using continuous digital light processing (cDLP) hydrogels the diblock and triblock copolymers can be photochemically printed from an aqueous solution into structures having a 10-fold increase in elongation at break compared to traditional diethyl fumarate (DEF) based printing. Furthermore, PPF-PEG-PPF triblock hydrogels have also been found in vitro to be biocompatible across a number of engineered MC3T3, NIH3T3, and primary Schwann cells.

This invention discloses a droplet microarray chip based on molecular logic operations and its construction method, belonging to the field of biochemical analysis and detection technology. It includes a substrate layer, a functional layer on the substrate layer, and molecular logic circuitry. The functional layer is a superhydrophilic-superhydrophobic patterned porous polymer film prepared in situ on the substrate using digital light processing technology, followed by PFOC acylation. The superhydrophilic-superhydrophobic patterned porous polymer film contains arrayed superhydrophilic microreaction units, separated by superhydrophobic polymer regions. Each superhydrophilic microreaction unit encapsulates an independent microdroplet, and the molecular logic circuitry is encapsulated within each independent microdroplet. This invention, through the combination of droplet microarray chip and molecular logic circuitry, achieves systematic improvements in multi-enzyme synergistic detection capabilities, logic computation complexity, spatial isolation control, high-throughput analysis, and adaptation to biological environments.

A method for fine-tuning 3D printing of large-scale complex fracture networks without filling belongs to the technical field of indoor physical simulation experiments. The method includes: conceptual model construction, reconstruction or design of fracture space structural characteristics according to the experimental purpose, and establishment of a complex fracture network conceptual model; fracture space structural characteristics include fracture opening, curvature, roughness, fracture scale, fracture occurrence, and fracture intersection position; digital model construction; printing material and parameter selection; physical model generation; physical model post-processing to obtain a large-scale cross-fracture model. The present invention is based on a method for making a fine-tuned model of a large-scale complex fracture network without filling using digital light processing 3D printing technology. The non-filling material can more finely control the fracture structure. On this basis, a transparent photosensitive resin is selected as the printing material to observe the flow of fluid inside the fracture, providing conditions for subsequent indoor experimental research on fluid seepage, heat transfer, and mass transfer laws in complex fracture networks.

The invention belongs to the technical field of biomedical materials, and discloses a natural tooth composite material bone grafting scaffold for alveolar bone repair and a design and preparation method thereof. The method comprises the following steps: collecting orthodontic teeth, impacted teeth, multiple teeth, loose teeth and other natural teeth extracted in oral medical treatment, and performing technical treatment to obtain raw material powder; ball-milling and mixing the bioactive glass powder, the carbon-based material powder and the natural dental powder to obtain mixed powder; the mixed powder is used as a raw material, and the bone grafting scaffold is obtained through computer aided design and digital light processing technology 3D printing; and modifying the surface of the 3D printing bracket by using the polydopamine-carbon-based material composite coating to obtain the natural tooth composite material bone grafting bracket. The natural tooth composite material bone grafting scaffold obtained by the invention has good mechanical property, controllable degradation property and antibacterial property, and has good biocompatibility and osteogenesis efficiency.

The utility model relates to an automatic liquid supplementing device applied to DLP (Digital Light Processing) equipment, which comprises a resin trough, a liquid level sensor arranged on the inner wall of the resin trough and used for detecting the resin level, a peristaltic pump connected with a resin barrel through a liquid pumping pipe, connected with the resin trough through a liquid feeding pipe, and used for feeding resin into the resin trough through the liquid feeding pipe, a liquid guide opening is reserved above the upper limit of the liquid level of the resin trough and can guide excessive resin into the resin filtering device through the first liquid return pipe, and the filtered resin is guided back to the resin barrel through the second liquid return pipe. A liquid level sensor is installed in the resin trough and used for detecting the resin level, the peristaltic pump is connected with the resin barrel through a liquid pumping pipe, resin is fed into the resin trough through a liquid feeding pipe, and meanwhile a liquid guiding opening is reserved above the upper limit of the liquid level of the resin trough and used for guiding excessive resin into the resin filtering device through a first liquid return pipe. And the filtered resin is guided back to the resin barrel through the liquid return pipe II.

The invention discloses a preparation method and application of a functional degradable soybean oil-based bionic porous composite bone scaffold. The method comprises the following steps: taking epoxidized soybean oil acrylate as a bio-based base material, compounding isobornyl methacrylate to improve the defects of high viscosity and low photosensitivity of the bio-based base material, adding a photoinitiator containing ethyl 2, 4, 6-trimethylbenzoyl phenyl phosphonate and phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide, compounding, and carrying out aging treatment to obtain base resin; mixing calcium lignosulphonate into the base resin to prepare composite photosensitive resin, and printing a triple-period extremely-small curved surface structure through a digital light processing technology and a 3D printing technology to finally obtain the functional degradable soybean oil-based bionic porous scaffold. The scaffold has calcium lignosulphonate-mediated controllable photo-thermal response behaviors of near-infrared light illumination regulation and bone scaffold component dependence under the condition of simulating the in-vivo environment of a human body, so that a controllable photo-thermal response-mediated remote shape memory function is realized, and meanwhile, a mild, safe and controllable photo-thermal curative effect can also be realized. Besides, calcium lignosulphonate promotes degradation of the composite scaffold by preferentially dissolving and generating a microporous structure on the surface of a matrix while improving the hydrophilic performance of the scaffold, and continuously releases calcium ions, so that the scaffold shows enhanced biomineralization ability and promotes cell proliferation and osteogenic differentiation. The research provides a solution with potential for the soybean oil-based biological photosensitive material in the digital light processing preparation technology and the multi-functional application of the bionic porous bone scaffold so as to deal with complex and irregular bone defects.

The invention provides a preparation method of a three-function nickel-cobalt alloy electrode, and belongs to the technical field of batteries, and the preparation method specifically comprises the following steps: printing a double-helix structure of NiCo resin through a digital light processing method; the double-helix structure is subjected to sintering treatment, cooling treatment and reduction treatment in sequence, and then 3D NiCo is obtained; the preparation method comprises the following steps: immersing 3D NiCo into a methanol solution containing Co (NO3) 2.6 H2O and 2-methylimidazole, and carrying out aging treatment to obtain Co-MOF / 3D-NiCo; and the Co-MOF / 3D-NiCo is sequentially subjected to washing treatment, drying treatment and carbonization treatment, and then the three-function nickel-cobalt alloy electrode is obtained. Compared with the prior art, the preparation method has the following advantages: the three-function nickel-cobalt alloy electrode prepared by utilizing the 3D printing technology disclosed by the invention has the advantages that the three-function nickel-cobalt alloy electrode is prepared by utilizing the multifunctional catalytic characteristic and the synergistic effect of the Ni-Co element; and growing a Co-based metal organic framework (MOF) precursor on the electrode and then anchoring cobalt nanoparticles into a nickel-doped carbon microarray through a carbonization process, so that the electrode becomes an efficient three-function catalytic electrode.

According to the 3D printing flexible hydrogel device for pancreas islet transplantation and the preparation method and application of the 3D printing flexible hydrogel device, functional ink containing N-acryloylurea amine and carboxylic acid betaine carbamido acrylate is developed, the digital light processing 3D printing technology is adopted, the ink formula and printing parameters are optimized, and the pancreas islet transplantation efficiency is improved. The 3D printing flexible hydrogel device for pancreas islet transplantation, which has excellent flexibility, biocompatibility and a controllable pore structure, is prepared. According to the device, a complex geometric structure of the hydrogel device is constructed layer by layer through a DLP printing technology, and accurate control over the porosity, the size and the shape of the device is achieved; the prepared hydrogel device can significantly improve the microenvironment after islet cell transplantation, provide effective protection, and improve the survival rate and transplantation success rate of islet cells.

Methods for calibrating a digital light processing additive manufacturing system. A method for scale factor calibration comprises: projecting calibration images of a calibration pattern by varying a projector's scaling factor; Capturing and analyzing the calibration images to determine dimensional attributes of the projected calibration pattern; Computing a calibration model fitting a relationship between the scaling factor and dimensional accuracy of the projector based on said dimensional attributes; Identifying a scaling factor where dimensional accuracy is optimal. A method for calibrating uniformity comprises: projecting a uniform pattern; capturing and analyzing a uniformity calibration image of said uniform pattern to determine a calibration intensity distribution of calibration image pixels; computing a correction map, wherein each correction map pixel is associated with a correction intensity determined using a tunable calibration factor and a calibration intensity of a corresponding calibration image pixel, wherein said tunable calibration factor depends on the calibration intensity distribution.