Flexible Build Platform for Additive Fabrication Part Release

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Solution Overview

Problem

In additive fabrication, the high adhesive forces between the fabricated parts and the build platform pose challenges during post-processing, as they can lead to damage of the parts and safety risks for users.

Innovation Solution

A build platform with a flexible sheet and actuation structure, where the sheet handles are attached to the flexible sheet, allowing for deformation of the build surface to release parts without damaging them.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If high adhesive forces are used between the fabricated parts and the build platform, then the parts remain stable during fabrication, but the parts become difficult to release without damage

Engineering Contradiction:

Improvestability of parts during fabricationVSAvoidease of part release

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The build platform is segmented into a rigid structure and a flexible sheet that can be independently actuated. The flexible sheet is divided into regions with different flexibility characteristics, allowing selective deformation to release parts while maintaining stability during fabrication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The build platform transitions from a static rigid structure to a dynamic system with a flexible sheet that can change its state. The flexible sheet can be deformed on-demand to release parts, while remaining stable during the fabrication process through controlled actuation.

Inventive Principle:

Principle #15Dynamics

2Strength

If a rigid build platform is used, then the structure provides stability, but it cannot deform to release parts without damage

Engineering Contradiction:

Improvestructural strength of build platformVSAvoidability to deform for part release

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The build platform has non-uniform properties with a rigid structure providing overall strength and a flexible sheet providing local deformability. Different regions of the flexible sheet can have different flexibility characteristics to match the specific release requirements of parts in different locations.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The build platform combines rigid structural elements with flexible sheet material to create a composite system. This allows the platform to exhibit both strength from the rigid structure and adaptability from the flexible sheet, resolving the contradiction between these two properties.

Inventive Principle:

Principle #40Composite materials

3Ease of operation

If the build platform is made flexible to release parts, then parts can be released easily, but the platform loses structural stability

Engineering Contradiction:

Improveease of part releaseVSAvoidstructural stability of build platform

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The build platform is divided into a rigid structural framework and a flexible functional sheet. The rigid structure maintains overall structural stability and supports the weight of the part, while the flexible sheet provides the deformability needed for easy part release.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A flexible sheet is used as the build surface instead of a completely rigid platform. This flexible sheet can be actuated to deform and release parts easily, while the rigid structural framework underneath provides the necessary structural stability and support.

Inventive Principle:

Principle #30Flexible shells and thin films

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 solution reduces the risk of part damage and user injury by allowing for controlled release of parts from the build platform, while maintaining sufficient adhesion during the fabrication process.

Implementation Method 1

an actuation structure coupled to the rigid structure and comprising one or more sheet handles and a flexible sheet, wherein the one or more sheet handles are attached to the flexible sheet, wherein a first surface of the flexible sheet forms a build surface on which the additive fabrication device is configured to form layers of material, and wherein the one or more sheet handles are configured to be actuated to deform at least a part of the flexible sheet away from the rigid structure

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS20250170773A1Techniques for releasing parts in additive fabrication and related systems and methods

Publication Date: 2025.05.29 FORMLABS INC

AI summary

An improved additive fabrication device and a build platform are provided. The additive fabrication device is configured to form layers of material on a build surface. The additive fabrication device comprising: a build platform comprising: a rigid structure; an actuation structure attached to the rigid structure, wherein the actuation structure comprises one or more sheet handles and a flexible sheet, and wherein a first surface of the flexible sheet forms a build surface on which the additive fabrication device is configured to form layers of materials; and the one or more sheet handles are configured to be actuated to apply a force to the flexible sheet while at least a part of the actuation structure remains attached to the rigid structure, to deform at least a part of the flexible sheet away from the rigid structure.