Multiplexed 3D Printhead With Parallel Nozzles for Fine Large-Scale Parts
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Solution Overview
Problem
Existing 3D printing methods for large structures face issues with geometric resolution, surface roughness, stiffness, strength, and geometric complexity, while maintaining fabrication time, particularly in processes like BAAM, which suffer from stair-step effects, material wastage, and thermal gradients leading to warping and reduced mechanical properties.
Innovation Solution
A multiplexed 3D printing system using multiple nozzles with dynamic on-off operation and gantry scanning, combined with passive rollers for heating and compression, to enhance geometric resolution, reduce surface roughness, and improve stiffness and strength, while maintaining throughput comparable to BAAM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If layer height and line width are increased to reduce fabrication time, then productivity is improved, but manufacturing precision deteriorates due to stair-step effects
Solution Approach 1:
The patent divides the printing task into multiple independent nozzles that work simultaneously, each handling a portion of the layer. This segmentation allows the system to maintain small layer heights and line widths for high precision while multiple nozzles work in parallel to achieve fast fabrication times, effectively resolving the contradiction between productivity and manufacturing precision.
2Productivity
If layer height is increased to improve productivity, then productivity is improved, but surface roughness worsens due to large scallops
Solution Approach 1:
Multiple nozzles deposit material in parallel, each creating fine lines with small layer heights. The combined effect of multiple nozzles achieves high material deposition rates while maintaining smooth surfaces with minimal scallops, as each nozzle operates at high precision settings without needing to increase layer height.
3Device complexity
If single nozzle is used for large planar parts, then device complexity is reduced, but manufacturing precision worsens due to spatial temperature gradients causing warpage
Solution Approach 1:
The patent segments the printing task across multiple nozzles distributed across the build area. This distribution balances the thermal load across different zones, preventing large spatial temperature gradients that cause warpage. Each nozzle operates in a localized region, maintaining geometric accuracy across the entire large planar part.
Solution Approach 2:
The patent transitions from a single-point deposition approach to a distributed array of deposition points across the build area. This spatial distribution in multiple dimensions allows simultaneous printing of different regions, balancing thermal gradients and preventing warpage while maintaining geometric accuracy.
4Manufacturing precision
If nozzle speed is reduced to improve manufacturing precision, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent segments the printing task into multiple nozzles that operate in parallel. Each nozzle can move at high speeds while maintaining precision, and the combined output of multiple nozzles achieves the total material deposition required. This parallelization allows high nozzle speeds without sacrificing geometric resolution, while overall productivity increases due to multiple simultaneous deposition streams.
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
The system achieves 10-100× enhancement in geometric resolution, 3× greater stiffness and strength, reduced material wastage, and allows for complex geometries with similar fabrication time, overcoming the limitations of conventional methods.
Implementation Method 1
Each nozzle may be equipped with one or more heated rollers that simultaneously heat and compress the material
Implementation Method 2
The corresponding roller passes over this just-deposited material and in-situ heats and compresses it
Data Source
AI summary
A multiplexed three-dimensional printing system including a printhead block (100) moveable in three-dimensions, the printhead block including a plurality of extruders (101, 103, 105), wherein each of the plurality of extruders is individually switchable between a deposition state and a retraction state, wherein the deposition state deposits a printing material, and wherein the retraction state prevents deposition of the printing material.