3D Printing Powder Estimation for Multi-Object Build Jobs
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Solution Overview
Problem
Existing techniques for estimating the amount of 3D-printing powder necessary for manufacturing a single part in a multi-part printing job are unreliable due to variations in polymer solid density versus powder density and unknown geometries of other parts in the build job.
Innovation Solution
A method that calculates the amount of printing material required by receiving data on the 3D-model of the object, including volume and surface area, as well as chamber characteristics, powder densities, and recycling ratios, to determine the volume of the powder layer, dilated object contribution, and total lost powder, ultimately calculating the required powder amount for 3D printing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If known techniques for predicting powder amount rely on calculations based on powder densities and volumes of single part and/or part bounding boxes, then the calculation process is simple, but the prediction results are unreliable
Solution Approach 1:
The build chamber is segmented into distinct zones (no-build zone, net-build zone, support zone) with different powder behavior characteristics. Each zone is calculated separately using appropriate density factors, allowing for more accurate predictions without requiring complex overall calculations.
Solution Approach 2:
The patent introduces multiple density parameters (loose powder density, tapped density, sintered density, zone-specific density factors) to account for different powder states and locations. This parameter differentiation enables reliable predictions while maintaining calculation simplicity through standardized formulas.
2Adaptability or versatility
If the geometries and number of other parts in the same build job are unknown, then the calculation process remains simple and adaptable, but the prediction results become unreliable due to variations in polymer solid density versus powder density
Solution Approach 1:
The system performs preliminary calculations for the known part's powder requirements (green state volume, sintered state volume, support powder) before other parts are added to the build job. This allows early estimation and planning while maintaining adaptability when additional parts are later incorporated.
Solution Approach 2:
Different density factors are applied to different spatial zones within the build chamber. The no-build zone uses one density factor, the net-build zone uses another, and support structures use yet another. This local differentiation maintains prediction reliability even when overall build job composition is not yet finalized.
3Manufacturing precision
If powder bed 3D-printing technologies are used to produce custom-manufactured plastic parts, then high-quality parts can be obtained, but the amount of printing material powder required becomes difficult to determine accurately in multi-part jobs
Solution Approach 1:
The calculation system incorporates feedback loops that adjust powder quantity estimates based on the interaction between multiple parts in the build chamber. As parts are added or modified, the system recalculate sintered state volumes and support powder requirements, ensuring accurate material determination while maintaining part quality through consistent process parameters.
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
This method provides a reliable calculation of the powder amount required for a single part in a multi-part build job, improving accuracy and reducing complex mathematical calculations, while also enabling cost calculations based on the determined powder amounts.
Implementation Method 1
SLS printing uses a laser to scan and fuse every powder cross-section. The laser device at the top of the chamber emits a beam that is directed with mirrors to draw a mask on the top layer of the powder. The beam applies energy and sinters the powder selectively, or in other words, it changes the printing material stage from powder to solid by heating the grains.
Implementation Method 2
MJF printing uses an ink as a fusing agent for promoting the absorption of infrared light. The surface is then exposed to heat from above so that the heat energy is collected to change the printing material stage from powder to solid.
Data Source
AI summary
Systems and a method determine an amount of printing material powder for 3D printing an object a multi-object printing job. Data on the following is received: a 3D-model of the object, a volume and a surface of the object, data on a thickness of a powder, on characteristics of the build chamber, a volume of a no build zone and a volume of a net build zone, an estimation of a volume of recyclable interstitial powder, on a powder density and on a solid density of the printing material and on a recycling ratio. The following quantities are determined: a volume of the powder layer around the object, a dilated object contribution, the amount of used powder due the dilated object, the amount of lost powder in the no build zone, the amount of lost powder in the net build zone and the amount of printing material required.