Parametric Fabrication of Spatially Varying Hydrogel Objects
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Solution Overview
Problem
Current additive manufacturing techniques lack the ability to create objects with varying material compositions and properties across different spatial locations, limiting the complexity and functionality of fabricated structures.
Innovation Solution
A water-based digital fabrication system that uses a CNC printer to extrude colloids or hydrogels with different chemical compositions, allowing for precise control of material deposition based on spatial position, including speed, toolpath directionality, nozzle diameter, air pressure, and material selection, enabling the creation of objects with tunable properties such as hydrophilicity and surface roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional additive manufacturing techniques are used, then objects can be fabricated with uniform material composition, but the ability to create objects with varying material compositions and properties across different spatial locations is limited
Solution Approach 1:
The patent applies local quality by enabling different material compositions to be deposited at different spatial locations within the same object. The system uses multiple colloids with distinct material properties (e.g., hydrophilic, hydrophobic, rigid, flexible) and controls their deposition location through digital design and CNC positioning, allowing each region of the fabricated object to have optimized material properties for its specific functional requirements
Solution Approach 2:
The patent implements parameter changes by digitally controlling multiple fabrication parameters including nozzle diameter, extrusion speed, air pressure, and material selection. These parameters are dynamically adjusted during the fabrication process based on the digital model, enabling precise control over material deposition characteristics and resulting object properties at different spatial positions
2Adaptability or versatility
If multiple colloids or hydrogels with different chemical compositions are extruded, then objects with spatially varying material properties can be created, but the complexity of the fabrication system increases
Solution Approach 1:
The patent applies universality by designing a multi-functional fabrication system that can handle multiple colloids with different material properties using a single apparatus. The system includes a library of pre-prepared colloids and a robotic arm with interchangeable nozzles that can deposit any combination of these materials, making the system versatile for creating objects with various material property combinations without requiring separate specialized equipment for each material type
Solution Approach 2:
The patent implements segmentation by dividing the fabrication system into modular components: a library of pre-prepared colloids with specific material properties, a robotic arm for positioning, an extruder for material deposition, and a control system for coordination. This segmentation allows each component to be optimized independently while working together to achieve complex material property tuning in the final object
3Manufacturing precision
If digital control of fabrication parameters is implemented, then precise control of material deposition and object properties is achieved, but the complexity of controlling multiple parameters increases
Solution Approach 1:
The patent applies feedback by implementing a closed-loop control system where sensors monitor fabrication parameters (position, extrusion rate, material flow) and the control system adjusts these parameters in real-time based on deviations from the digital model specifications. This feedback mechanism maintains manufacturing precision despite the complexity of controlling multiple interacting parameters during the fabrication process
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the fabrication of objects with complex, spatially varying properties, such as hydrophilicity and surface roughness, by modulating the extrusion parameters, allowing for the integration of microorganisms and bioactive materials that can perform functions like bio-mineralization and tissue formation.
Implementation Method 1
A CNC fabricator deposits the multiple materials to form a physical object
Implementation Method 2
Dry or cure deposited materials
Implementation Method 3
Dry or cure deposited materials
Data Source
AI summary
Multiple colloids or hydrogels may each have a different chemical composition. A printer may extrude the colloids or hydrogels to form a physical object, in such a way that which hydrogel or colloid is deposited—or the amount of each hydrogel or colloid that is deposited—varies as a function of spatial position. Thus, the material composition and material properties of the physical object may vary at different locations. In some cases, physical properties of the structure being fabricated, such as surface roughness and hydrophilicity, are directly related to relative proportions of the materials being deposited and their fabrication processes. In some cases, cells, microorganisms, nutrients or other bioactive materials are embedded in or introduced to the fabricated structure. In some cases, the different materials in different spatial positions in the fabricated object may have different abilities to immobilize, localize, and stabilize specific nutrients and chemical signals.