Multi-Material 3D Printing With Separate Recovery and Reuse
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Solution Overview
Problem
Existing 3D printing technologies for multi-layer components with different materials are inefficient and expensive due to excess raw material usage and the inability to print multiple layers with different materials in a single process without material mixing.
Innovation Solution
A 3D printer design with separate dispensers and recovery devices for each raw material, allowing for selective recovery and reuse, along with a conveyor belt that decouples material supply from production and recovery, enabling flexible setup and preventing material mixing, and a radiation-transmissive conveyor belt for efficient hardening and recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single dispenser and recovery device are used for multiple raw materials, then device complexity is reduced, but material mixing occurs and manufacturing precision deteriorates
Solution Approach 1:
The system divides the dispensing and recovery functions into separate units for each raw material. Each dispenser is dedicated to a specific raw material, and each recovery device recovers only its corresponding material, preventing mixing and ensuring material purity in multi-layer components.
Solution Approach 2:
Each dispenser and recovery device is locally optimized for a specific raw material type. The dispensers apply materials at specific locations on the conveyor belt, and recovery devices are positioned to collect only the intended material, ensuring local material purity and preventing cross-contamination.
2Device complexity
If excess raw material is not recovered and reused, then the manufacturing process becomes simpler, but substance loss increases and productivity decreases
Solution Approach 1:
The system implements recovery devices that collect excess raw material from the conveyor belt and return it to the corresponding dispensers. This closed-loop approach minimizes material waste, reduces the need for continuous material supply, and improves process sustainability.
Solution Approach 2:
The recovery system creates a feedback loop where unused material is collected, processed, and fed back into the dispensing system. This ensures consistent material availability and maintains homogeneous composition in printed layers by replenishing material from the same batch.
3Manufacturing precision
If the entire printer is cleaned for material changes, then manufacturing precision is maintained, but loss of time increases and productivity decreases
Solution Approach 1:
The system segments the material handling functions so that each dispenser and recovery device is dedicated to a specific material. This allows material changes to occur by simply switching which dispensers and recovery devices are active, rather than cleaning the entire system, thus maintaining precision without time loss.
4Manufacturing precision
If multiple components are printed separately and assembled, then manufacturing precision of individual components is maintained, but productivity decreases and device complexity increases
Solution Approach 1:
The system merges multiple printing operations into a single continuous process by using a conveyor belt that transports material through multiple dispensing zones. Different raw materials are applied in sequence to the same component in one pass, eliminating the need for separate printing and assembly steps while maintaining material purity through dedicated dispensers.
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 efficient and resource-saving printing of components with multiple layers of different materials in a single process, reducing waste and allowing for flexible material management and homogeneous layer composition.
Implementation Method 1
The raw material, in this case photosensitive, then cures through photopolymerization of a contained binder
Data Source
Figure 1
Figure 2A~2F
Figure 3~4
AI summary
The invention relates to a 3D printer for the additive manufacture of a multilayer component. The 3D printer comprises: at least two separate dispensers (2) which coat a conveyor belt (3) in each case with a different raw material; a manufacturing unit in which at least part of the raw material is joined to the component (8) as a new layer; at least two separate recovery devices (12) for selectively recovering each different raw material which is not used when a layer is added onto the component (8), and for returning the raw material to the associated dispenser (2); and the conveyor belt (3) which transports the raw material from the dispenser (2) to the manufacturing unit and onwards to the recovery device (12) in the lateral direction.