3D Printed Layer Winding to Minimize Sintering Deformation

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Solution Overview

Problem

3D printed parts often experience stress-related deformations due to unbalanced torques during the debinding and sintering processes, leading to non-uniformity and geometrical mismatches in identical parts.

Innovation Solution

A method is employed where adjacent layers of a 3D printed part are built with alternating winding directions to offset stored torques, neutralizing them during the debinding and sintering process, thereby reducing part twists and deformations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If layers are printed in a single winding direction, then printing efficiency is improved, but stress-related deformations occur due to unbalanced torques

Engineering Contradiction:

Improveprinting efficiencyVSAvoidgeometrical accuracy

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The patent implements periodic alternation of winding directions between adjacent layers. The print head deposits material in one winding direction for a layer, then reverses direction for the next layer, creating a periodic pattern that balances accumulated torques and prevents stress-related deformations while maintaining continuous printing operation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent applies inversion by reversing the winding direction of the print head between adjacent layers. Instead of maintaining a consistent winding direction, the system deliberately prints alternating layers in opposite directions (e.g., clockwise then counter-clockwise), which inverts the torque accumulation pattern and neutralizes stress build-up.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If material is extruded rapidly to increase productivity, then printing speed is improved, but stored torques increase causing part twists during debinding and sintering

Engineering Contradiction:

Improveprinting speedVSAvoidpart geometry

Core Design Contradiction:

ProductivityVSShape

Solution Approach 1:

The patent applies preliminary anti-action by intentionally introducing counteracting torques during the printing process itself. By alternating winding directions between layers, the system pre-balances the stored torques before the debinding and sintering processes occur, preventing future part twists and geometrical deviations.

Inventive Principle:

Principle #9Preliminary anti-action

3Productivity

If continuous printing is performed without direction changes, then manufacturing efficiency is improved, but uniformity between identical parts deteriorates

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidpart uniformity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

Inventive Principle:

Principle #19Periodic action

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 approach effectively minimizes stress-related deformations and maintains the geometrical accuracy of 3D printed parts by balancing torques across layers, ensuring uniformity and consistency in printed structures.

Implementation Method 1

By winding adjacent slices in alternating directions, offsetting stored torques can be produced for each printed slice

Methodology Applied

Scientific EffectStored torque:

Implementation Method 2

The stored torques then neutralize one another during the debinding and sintering process, reducing part twists and deformations

Methodology Applied

Scientific EffectStress relaxation: Stress Relaxation

Data Source

PatentUS12521935B2Method for minimizing stress-related deformations in 3D printed and sintered parts

Publication Date: 2026.01.13 MARKFORGED INC

AI summary

A method for printing three-dimensional parts includes building a three-dimensional part by printing counter-wound slices. By winding adjacent slices in alternating directions, offsetting stored torques can be produced for each printed slice. The stored torques then neutralize one another during the debinding and sintering process, reducing part twists and deformations.