Microwave-based 3D printing consumable online instant drying device and method
By using a microwave-based online instant drying device that combines microwave radiation and hot air, the problem of moisture absorption in engineering plastic consumables is solved, enabling rapid drying and stable temperature control of the consumables, thus improving the flexibility and efficiency of 3D printing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHANGHAI OUDIAN CLOUD INFORMATION TECH CO LTD
- Filing Date
- 2026-04-29
- Publication Date
- 2026-06-02
Smart Images
Figure CN122125904A_ABST
Abstract
Description
Technical Field
[0001] This invention mainly relates to the field of 3D printing technology, specifically to an online instant drying device and method for 3D printing consumables based on microwave. Background Technology
[0002] In FDM (Fused Deposition Modeling) 3D printing technology, engineering plastic consumables such as PA nylon, PC, and TPU have extremely strong hygroscopicity. After absorbing moisture from the air, water bursts will occur in the high-temperature printing nozzle, directly resulting in rough surface of the printed parts, severe stringing, reduced interlayer bonding, and a significant decrease in mechanical properties.
[0003] The current mainstream solution in the industry is a drying oven / baking box, which uses surface conduction heating of air via resistance wire. Heat can only penetrate layer by layer from the outer layer of the consumables inwards. Moisture inside the tightly wound consumables is difficult to expel, and nylon consumables require continuous baking at 70℃ for 6-12 hours before use. Furthermore, prolonged heating of the entire roll of consumables can cause the outer layer material to become brittle and age, making it unusable immediately after opening. It also suffers from significant energy waste and poor usability. Based on these problems, the industry urgently needs an online drying technology that can achieve instant drying of consumables, is highly efficient and energy-saving, and does not damage the consumables. Summary of the Invention
[0004] 1. The technical problem that the invention aims to solve: This invention provides an online instant drying device and method for 3D printing consumables based on microwave, in order to solve the technical problems existing in the background art.
[0005] 2. Technical Solution: To achieve the above objectives, the technical solution provided by the present invention is as follows: An online instant drying device for 3D printing consumables based on microwaves includes a microwave shielded resonant cavity, a microwave source, a PTFE microwave transparent conduit, a hot air fan, an infrared temperature probe, a PID controller, and an exhaust port. The microwave shielded resonant cavity is a metal-enclosed cavity with consumable inlets and outlets on its side walls. Microwave chokes or cutoff waveguide structures are installed at the inlets and outlets, forming a resonant heating zone within the cavity. The microwave source is located within the cavity and can emit microwaves in the 0.3GHz~300GHz frequency band, providing stable microwave radiation to the resonant heating zone. The PTFE microwave transparent conduit penetrates the cavity. A zigzag flow structure is formed within the cavity, allowing the consumable to pass through the resonant heating zone multiple times. The zigzag flow can be circular, Z-shaped, planar, or three-dimensional. The two ends of the conduit are a wet consumable inlet and a dry consumable outlet, respectively. The dry consumable outlet is connected to the printer extruder. A hot air blower injects dry hot air into the cavity. An infrared temperature sensor is positioned at the dry consumable outlet to detect the surface temperature of the consumable. A PID controller is connected to the infrared temperature sensor and a microwave source, adjusting the microwave source power based on the temperature signal. An exhaust vent is located on the cavity to expel the humid and hot air.
[0006] Furthermore, the microwave source is a magnetron + waveguide structure or a solid-state microwave source, preferably with an operating frequency of 2.45 GHz.
[0007] Furthermore, the PTFE microwave transparent conduit forms at least three path reversals within the microwave shielded resonant cavity, with each reversal path passing through the resonant heating zone.
[0008] Furthermore, the PTFE microwave transparent conduit has a breathable structure, which facilitates the discharge of moisture.
[0009] Furthermore, the infrared temperature probe detects the current temperature T_current of the consumable at the outlet of the drying consumable in real time.
[0010] Furthermore, the PID controller uses a period of 100ms, takes the difference between the target temperature T_target and the current temperature T_current as the error signal, adjusts the power or duty cycle of the microwave source, and sets a safe no-load power threshold.
[0011] Furthermore, the temperature of the drying hot air output by the hot air blower is lower than the target drying temperature of the consumables, which is used to remove moisture and cool the consumables.
[0012] Furthermore, the volume of the microwave shielded resonant cavity is adapted to the standing wave formation conditions of the corresponding frequency microwave to generate a stable resonant heating zone.
[0013] Furthermore, the device can be a stand-alone external box or an integrated structure within the 3D printer body.
[0014] A microwave-based online instant drying method for 3D printing consumables includes the following steps: S1. Moist consumables are drawn by the printer extruder and enter the PTFE microwave transparent conduit through the moist consumables inlet; S2. The consumable material passes through the resonant heating zone multiple times along the folding structure inside the conduit. The microwaves emitted by the microwave source penetrate the consumable material to achieve body heating, which directly acts on the internal water molecules to vaporize the water from the inside out. S3. The hot air blower injects dry hot air into the microwave shielded resonant cavity, carrying away the moisture on the surface of the consumables and continuously expelling it through the exhaust port. S4. The infrared temperature probe detects the temperature of the consumable at the outlet of the drying consumable in real time with a period of 100ms. The PID controller dynamically adjusts the microwave source power according to the error between the target temperature and the current temperature to keep the consumable temperature stable at the set value. S5. After drying, the consumable material enters the printer extruder directly through the dried consumable material outlet, and the 3D printing operation is performed immediately.
[0015] 3. Beneficial effects: Compared with the prior art, the technical solution provided by this invention has the following advantages: This invention employs microwave heating technology to directly stimulate water molecule oscillation and generate heat from within the consumable material. Unlike traditional hot air drying with surface conduction heating, this allows for instant drying within seconds, completely solving the problem of long preheating times required by traditional ovens. The device only heats the section of consumable material currently in use, resulting in high energy utilization and energy efficiency. Furthermore, it uses a one-time flow heating method, avoiding thermal aging and embrittlement issues caused by prolonged baking of the entire roll of consumable material. Through a closed-loop temperature control system composed of infrared temperature measurement and a PID controller, the microwave power can be adaptively adjusted according to the moisture content of the consumable material, ensuring thorough drying while preventing overheating and softening. This truly enables plug-and-play printing, significantly improving the flexibility of 3D printing.
[0016] This invention utilizes a multi-path folding design through the resonant cavity to maximize the use of cavity space while meeting the conditions for microwave standing wave formation. The device is compact and can be used independently externally or integrated into the printer body. The resonant cavity inlet and outlet are equipped with microwave chokes or cutoff waveguide structures, along with automatic overheat protection, effectively preventing microwave leakage and equipment overheating, ensuring safe and compliant use. The device is also compatible with solid-state microwave sources and humidity sensors for extended solutions, enabling further miniaturization and precise determination of dryness. It is suitable for various hygroscopic FDM 3D printing consumables such as PA nylon, PC, and TPU, and has a wide range of applications and strong adaptability.
[0017] It should be noted that the structures not described in this invention are not related to the design points and improvement directions of this invention, and are the same as or can be implemented using existing technologies, so they will not be elaborated here. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the device structure of the present invention; Figure 2 This is a flowchart of the method of the present invention; Figure 3 This is a flowchart of the temperature control logic of the present invention. Detailed Implementation
[0019] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be more thorough and complete.
[0020] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "page," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.
[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "fixed," "provided with," and "located in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. An online instant drying device for 3D printing consumables based on microwaves is disclosed. This device can be a standalone external unit or integrated into the printer. It includes a microwave shielded resonant cavity, a microwave source, a PTFE microwave transparent conduit, a hot air fan, an infrared temperature probe, a PID controller, and an exhaust port. The specific structure is as follows: The microwave shielded resonant cavity is a closed cavity made of metal, with consumable inlets and outlets on the side walls. Microwave chokes or cutoff waveguide structures are installed at the inlets and outlets to effectively shield microwave leakage while allowing consumables to enter and exit, meeting equipment safety certification requirements. The cavity is designed to accommodate microwave resonance. For commonly used 2.45GHz microwaves, the cavity volume must meet the standing wave formation conditions, forming a stable resonant heating zone within the cavity, covering the resonance conditions of the entire microwave band from 0.3GHz to 300GHz. The microwave source uses a magnetron + waveguide structure or a solid-state microwave source, which is placed in a microwave shielded resonant cavity. It can emit microwaves in the frequency band of 0.3GHz to 300GHz (preferably 2.45GHz) to provide stable microwave radiation for the resonant heating region and achieve selective dielectric heating by utilizing the polarity of water molecules. The PTFE microwave transparent conduit and its folding-through structure utilize high-temperature resistant, microwave-permeable polytetrafluoroethylene (PTFE) conduit, which is breathable to facilitate moisture removal. The conduit penetrates the microwave-shielded resonant cavity, forming a folding-through structure within the cavity. The consumable material passes through the resonant heating zone multiple times in a manner similar to "intestinal flow," such as path folding-through 1, path folding-through 2, and path folding-through 3. The folding-through form is not limited, including loop-shaped, Z-shaped, planar, or three-dimensional structures. This design not only extends the effective heating time of the consumable material in the resonant heating zone but also makes full use of the cavity space, solving the problem that the microwave cavity needs sufficient volume to form a stable standing wave. The two ends of the conduit are the inlet for moist consumable material and the outlet for dry consumable material, respectively. The outlet for dry consumable material is connected to the printer extruder. A hot air blower injects dry hot air into the microwave shielded resonant cavity. Combined with the heating of the microwave body, this quickly removes the water vapor that has vaporized on the surface of the consumables. At the same time, it moderately cools the consumables to prevent them from softening, maintains the ambient temperature of the cavity, and prevents water vapor from condensing. The hot and humid air inside the cavity is discharged through the exhaust port. The closed-loop temperature control system consists of an infrared temperature probe and a PID controller. The infrared temperature probe is set at the outlet of the drying consumable to detect the surface temperature T_surf (i.e., the current temperature T_current) of the consumable in real time. The PID controller uses the difference between the target temperature T_target and the current temperature T_current as the error signal E (E=T_target-T_current) and executes a real-time temperature control cycle with a period of 100ms to accurately adjust the power or duty cycle of the microwave source to achieve closed-loop temperature control. At the same time, an unloaded safe power threshold is set to avoid overheating when there is no consumable. The safety protection structure includes microwave chokes / cutoff waveguides at the inlet and outlet to prevent microwave leakage; it also features automatic power cut-off protection against overheating of the cavity to ensure safe operation of the equipment. A microwave-based online instant drying method for 3D printing consumables. This method abandons the offline baking mode for whole rolls and adopts online flow instant drying. The complete workflow is as follows: Consumable traction feeding: The 3D printer extruder starts and generates traction force, which smoothly feeds the wet consumable on the material tray from the wet consumable inlet into the PTFE microwave transparent conduit, and the consumable is transferred to the resonant heating zone at a uniform speed. Multi-path foldback transmission: The consumable passes through the resonant heating zone multiple times along the PTFE microwave transparent conduit, extending its residence time in the cavity in a manner similar to "intestinal bypass", making full use of the cavity space and meeting the duration requirements of microwave standing wave heating; Microwave body heating dehydration: The microwave source continuously emits microwaves into the resonant heating area, which penetrates the consumable and acts directly on the internal water molecules to achieve body heating. This is different from the surface conduction heating of traditional hot air drying, which causes water molecules to oscillate and generate heat through friction at high speed. The water vaporizes rapidly from the inside to the outside and migrates to the surface of the consumable. Hot air sweeping and dehumidification: The hot air fan simultaneously injects constant temperature dry hot air into the microwave shielded resonant cavity. The hot air continuously sweeps the surface of the consumables, quickly enveloping vaporized water vapor, which is discharged to the external environment through the exhaust holes on the cavity, while avoiding water vapor condensation and backflow in the cavity. Closed-loop temperature control: An infrared temperature probe collects the surface temperature T_current of the consumable at the outlet of the drying consumable in real time and transmits the temperature signal to the PID controller in real time. The controller calculates the temperature error in 100ms cycles and dynamically adjusts the microwave source power: When T_current < T_target, it is determined that the moisture content of the consumable is high and the heat absorption of evaporation is large. The microwave source power / duty cycle is immediately increased to quickly replenish heat and accelerate dehydration. When T_current > T_target, it is determined that the consumable is sufficiently dried or the temperature is too high. The microwave source power is immediately reduced or microwave radiation is stopped to avoid softening and deformation of the consumable. At the same time, an unloaded safe power limit is set to prevent the cavity from overheating. Drying and printing: The dried consumables, which have undergone dehydration and temperature control, are output from the dried consumables outlet and directly enter the printer extruder and print head. They can be used for 3D printing immediately without the need for intermediate storage.
[0023] Example 1 An independent external drying unit, consisting of a rectangular box with a wet consumable inlet (connected to the material tray) at one end and a dry consumable outlet (connected to the printer extruder) at the other. Microwave components: A 2.45GHz magnetron is used as the microwave source. Microwave chokes are installed at the consumable entry and exit points of the metal microwave shielded resonant cavity to prevent microwave leakage and meet safety requirements. The cavity volume is adapted to the standing wave formation conditions to stably generate a resonant heating zone. Transmission mechanism: The PTFE microwave transparent catheter forms a Z-shaped folding structure in the resonant cavity, with a total of 3 path folding. The catheter has micropores for ventilation. The consumables pass through the resonant heating zone multiple times in a manner similar to "intestinal bypass", extending the heating path and making full use of the cavity space. Hot air system: The hot air fan outputs 60℃ dry hot air, which continuously blows on the surface of the consumables, removes moisture, and the hot and humid air is discharged through the exhaust port; Temperature control system: An infrared temperature probe is placed at the outlet of the drying consumables to detect the surface temperature T_surf of the consumables in real time, with the target temperature T_target set to 90℃; the PID controller collects temperature data every 100ms and calculates the error E=T_target-T_current: when T_current<T_target, it is determined that the moisture content of the consumables is high and the heat absorption of evaporation is large, and the microwave source power / duty cycle is immediately increased to quickly replenish heat and accelerate dehydration; when T_current>T_target, it is determined that the consumables are sufficiently dried or the temperature is too high, and the microwave source power is immediately reduced or microwave radiation is stopped to avoid softening and deformation of the consumables; when the device is unloaded and there are no consumables, the microwave source power is automatically limited to a safe no-load power of 300W to prevent the cavity from overheating; Safety protection: When the cavity temperature exceeds 120℃, the microwave source and hot air fan power supply will be automatically cut off.
[0024] Example 2 The printer-integrated drying unit is integrated into the 3D printer body, with a reserved feed port for connecting the material tray. It uses a solid-state microwave source instead of a magnetron, resulting in a smaller size and more precise power control. The PTFE conduit adopts a three-dimensional spiral folding structure to further improve space utilization. A humidity sensor is added to the exhaust port to help determine the degree of drying and optimize the temperature control logic. Microwave chokes are also set at the inlet and outlet to ensure safe use.
[0025] Example 3 This embodiment of the miniaturized integrated drying device with a solid-state microwave source is a preferred extension of Embodiment 2, optimized for the built-in integration scenario of desktop 3D printers. The core improvement is the use of a solid-state radio frequency chip to replace the traditional magnetron + waveguide structure as the microwave source. Microwave source configuration: A 2.45GHz solid-state RF chip is selected, which realizes microwave radiation based on the principle of semiconductor devices. Its volume is only 1 / 10 of that of a traditional magnetron. It can be directly installed on the side wall of the microwave shielded resonant cavity without the need for additional waveguide components. The solid-state RF chip supports millisecond-level frequency and power adjustment, covering the entire frequency band from 0.3GHz to 300GHz. The power duty cycle adjustment accuracy can reach 1%, which is far superior to the coarse control of the magnetron. Control linkage: The solid-state RF chip communicates directly with the PID controller via the I2C bus. The PID controller synchronously sends frequency and power adjustment commands with a period of 100ms to achieve fine control of microwave radiation in the resonant heating zone, which can accurately match the heating requirements of different consumables and different water contents. Device compatibility: The overall size of the device has been greatly reduced, and it can be directly embedded inside the body of a desktop 3D printer, forming an integrated structure with the extruder and material tray, without the need for external installation; at the same time, the microwave choke structure at the inlet and outlet is retained to ensure that microwave leakage protection meets safety requirements. Advantages and effects: This embodiment solves the shortcomings of traditional magnetron equipment, such as large size and low control precision, and is suitable for office and home scenarios with limited space. At the same time, it improves the stability of temperature control, avoids the problem of local overheating or insufficient drying of consumables caused by microwave power fluctuations, and extends the service life of the equipment.
[0026] Example 4 This is a preferred extension of Embodiment 1, which optimizes the accuracy of dryness determination. The core improvement is the addition of a humidity sensor at the exhaust port, linked to a PID controller. Sensor configuration: A high-precision humidity sensor is installed at the exhaust port of the microwave shielded resonant cavity to monitor the relative humidity of the exhaust hot and humid air in real time, with a detection accuracy of ±2%RH; the humidity sensor is electrically connected to the PID controller to transmit humidity data in real time. Linkage control logic: The PID controller simultaneously receives temperature signals from the infrared temperature probe and humidity signals from the humidity sensor, establishing a dual judgment mechanism: when the humidity sensor detects that the moisture concentration at the exhaust port is consistently below a preset threshold (e.g., relative humidity <10%), it feeds back a signal to the PID controller to assist in determining that the dryness of the consumables has met the standard; if the temperature signal is stable at the target value at this time, the PID controller can reduce the microwave source power to the maintenance power (e.g., 30% of the rated power), or pause microwave radiation and only retain hot air blowing to achieve energy saving and consumption reduction; Calibration mechanism: When there is a deviation between infrared temperature measurement data and humidity data (such as the temperature meets the standard but the humidity concentration is still high), the system triggers the calibration mechanism, automatically increases the microwave source power and extends the heating time of consumables in the resonant heating zone, avoiding misjudgment caused by single temperature detection; This embodiment solves the problem that single temperature detection cannot directly reflect the internal dryness of consumables by using dual temperature and humidity detection, thereby improving the reliability and consistency of drying control and further ensuring the stability of drying effect for different batches of consumables with different moisture contents.
[0027] The specific workflow is as follows: Start-up preparation: Turn on the 3D printer and online drying device. The device completes self-test. The microwave source (magnetron or solid-state RF chip), hot air blower, infrared temperature probe, humidity sensor, and PID controller enter standby mode. The user sets the target drying temperature in the operation interface (e.g., 90℃ for PA12 consumables). Traction feeding: The printer extruder starts and pulls the wet consumables at a constant speed. The consumables smoothly enter the PTFE microwave transparent conduit from the wet consumables inlet. Reverse heating: The consumable passes through the resonant heating zone multiple times in the conduit along the reversible structure (path reversal 1, path reversal 2, path reversal 3). The microwaves emitted by the microwave source penetrate the consumable, and the internal water molecules oscillate rapidly to generate heat, and the water vaporizes and seeps out from the inside. Hot air dehumidification: The hot air fan continuously delivers 60℃ dry hot air, forming a directional airflow in the cavity, quickly blowing away the moisture on the surface of the consumables. The hot and humid mixed gas is continuously discharged through the exhaust port, maintaining a dry environment in the cavity. Precise temperature control and linkage adjustment: The infrared temperature probe collects the T_current at the outlet of the drying consumable in real time with a period of 100ms. The PID controller calculates E=T_target-T_current in real time: if the error is positive, the microwave power is increased to heat up quickly; if the error is negative, the microwave power is reduced or turned off to cool down; if the error approaches zero, a constant power is maintained; if the device is equipped with a humidity sensor, the PID controller receives the humidity signal synchronously to help determine the degree of dryness and dynamically optimize the power output. Instant printing: Consumables that have reached the specified temperature and are fully dried are output from the dried consumables outlet and directly fed into the printer extruder, where they are melted and formed by the nozzle. The entire process is seamless with no waiting or transfer, enabling plug-and-print functionality.
[0028] The above-described embodiments are merely illustrative of certain implementations of the present invention, and are described in a relatively specific and detailed manner. However, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.
Claims
1. A microwave-based online instant drying device for 3D printing consumables, characterized in that: The system includes a microwave-shielded resonant cavity, a microwave source, a PTFE microwave transparent conduit, a hot air blower, an infrared temperature probe, a PID controller, and an exhaust port. The microwave-shielded resonant cavity is a metal-enclosed cavity with consumable inlets and outlets on its side walls. Microwave chokes or cutoff waveguide structures are installed at the inlets and outlets, forming a resonant heating zone within the cavity. The microwave source, located within the cavity, emits microwaves in the 0.3GHz~300GHz frequency band, providing stable microwave radiation to the resonant heating zone. The PTFE microwave transparent conduit penetrates the cavity, forming a zigzag flow structure within the cavity. The consumables flow through the resonant heating zone in multiple loops, with zigzag, planar, or three-dimensional structures as the zigzag forms. The two ends of the conduit are a wet consumable inlet and a dry consumable outlet, respectively. The dry consumable outlet is connected to the printer extruder. The hot air blower injects dry hot air into the cavity. The infrared temperature probe is located at the dry consumable outlet to detect the surface temperature of the consumables. The PID controller is connected to the infrared temperature probe and the microwave source, adjusting the microwave source power based on the temperature signal. The exhaust port is located on the cavity to expel the humid and hot air.
2. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The microwave source is a magnetron + waveguide structure or a solid-state microwave source, preferably with an operating frequency of 2.45 GHz.
3. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The PTFE microwave transparent conduit forms at least three path reversals within the microwave shielded resonant cavity, with each reversal path passing through the resonant heating zone.
4. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The PTFE microwave transparent conduit has a breathable structure, which facilitates the discharge of moisture.
5. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The infrared temperature probe detects the current temperature T_current of the consumable at the outlet of the drying consumable in real time.
6. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The PID controller uses a period of 100ms, takes the difference between the target temperature T_target and the current temperature T_current as the error signal, adjusts the power or duty cycle of the microwave source, and sets a safe no-load power threshold.
7. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The hot air output by the hot air blower is at a temperature lower than the target drying temperature of the consumables, and is used to remove moisture and cool the consumables.
8. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The volume of the microwave shielded resonant cavity is adapted to the standing wave formation conditions of the corresponding frequency microwaves to generate a stable resonant heating zone.
9. The microwave-based online instant drying device for 3D printing consumables according to claim 1, characterized in that: The device can be an independent external box or an integrated structure within the 3D printer body.
10. A method for online instant drying of 3D printing consumables based on the apparatus of any one of claims 1-9, characterized in that, Includes the following steps: S1. Moist consumables are drawn by the printer extruder and enter the PTFE microwave transparent conduit through the moist consumables inlet; S2. The consumable material passes through the resonant heating zone multiple times along the folding structure inside the conduit. The microwaves emitted by the microwave source penetrate the consumable material to achieve body heating, which directly acts on the internal water molecules to vaporize the water from the inside out. S3. The hot air blower injects dry hot air into the microwave shielded resonant cavity, carrying away the moisture on the surface of the consumables and continuously expelling it through the exhaust port. S4. The infrared temperature probe detects the temperature of the consumable at the outlet of the drying consumable in real time with a period of 100ms. The PID controller dynamically adjusts the microwave source power according to the error between the target temperature and the current temperature to keep the consumable temperature stable at the set value. S5. After drying, the consumable material enters the printer extruder directly through the dried consumable material outlet, and the 3D printing operation is performed immediately.