3D Printed Wall Openings Using U-Turn Layer Interruptions
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Solution Overview
Problem
Current 3D printing methods face challenges in creating well-defined openings in printed walls with minimal material usage and without seams, especially when the openings are non-parallel to the receiver item, leading to potential defects and increased material consumption.
Innovation Solution
A method for producing 3D items using fused deposition modeling that involves layer-wise deposition with oppositely arranged turns forming U-turns, where each turn connects first and second layer parts with a path length within a specific radius range, allowing for well-defined openings with reduced material usage and seamless walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional 3D printing methods are used to create openings in printed walls, then the openings can be formed, but the openings are not well-defined and contain seams
Solution Approach 1:
The printing process is segmented into multiple passes: first printing the wall structure, then making interruptions at specific locations, and finally completing the layers by printing over the interruptions. This segmentation allows openings to be precisely defined without seams, as the printer head strategically deposits material to form clean edges around openings rather than attempting to print through them.
Solution Approach 2:
The method performs preliminary action by making interruptions in layers before completing the wall structure. The printer head anticipates where openings should be located and creates gaps in the printing path at these locations before continuing to print the remaining wall material, ensuring well-defined opening edges from the start of the printing process.
2Quantity of substance
If conventional printing methods create openings by printing through the structure, then openings are formed, but material usage increases and structural integrity is compromised
Solution Approach 1:
The method extracts the unnecessary printing action at opening locations by making interruptions in the layers. Instead of printing material that would later need to be removed or would create weak points, the printer head strategically skips these areas, taking out the harmful action of depositing material where openings are required. This reduces material consumption and maintains wall integrity by avoiding weak points.
Solution Approach 2:
The printing approach applies local quality by treating different regions of the wall differently. At opening locations, the printer makes interruptions and avoids depositing material, while at wall regions, normal printing continues. This localized differentiation ensures material is only deposited where structural integrity is needed, optimizing both material usage and strength.
3Manufacturing precision
If the printer head makes frequent stops and starts to create openings, then opening positions can be controlled, but printing time increases
Solution Approach 1:
The method maintains continuity of useful action by integrating opening creation into the normal printing flow. The printer head continues its scanning motion across the wall, and openings are created as natural interruptions in this continuous path rather than requiring separate positioning operations. The head moves continuously, making brief pauses only when transitioning between wall sections and opening areas, minimizing stops while maintaining precise opening position control.
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 enables the creation of 3D items with well-defined openings and reduced material usage, minimizing defects and the need for double-layer printing, while maintaining structural integrity and appearance.
Implementation Method 1
A method for producing a 3D item by means of fused deposition modelling comprises a 3D printing stage comprising layer-wise depositing an extrudate comprising 3D printable material
Data Source
Figure 1A~1B
Figure 1C~2B
Figure 2C~2D
AI summary
A method for producing a 3D item (1) by means of fused deposition modelling, the method comprising a 3D printing stage comprising layer-wise depositing an extrudate (321) comprising 3D printable material (201), to provide the 3D item (1) comprising 3D printed material (202), wherein the 3D item (1) comprises a plurality of layers (322) of 3D printed material (202), and an opening (405) in the 3D printed material (202), the opening (405) having an opening edge (410) that is at least partly defined by one or more interruptions (1410) in a subset (1322) of one or more layers (322) of the plurality of layers (322), wherein the method comprises providing each interruption (1410) by 3D printing a layer (322) of the subset (1322) with oppositely arranged turns (415), wherein each turn (415) connects a first layer part (3221) and a second layer part (3222), the first layer part (3221) and the second layer part (3222) forming legs of a U-turn (435), wherein, for each turn (415), the first layer part (3221) has a first length (LI) and the second layer part (3222) has a second length (L2), the second length (L2) being shorter than the first length (LI) such that over only part of the layer (322) the first layer part (3221) and the second layer part (3222) are configured adjacent, and wherein each turn (415) has a path length (Lr) with a radius of curvature (rl), and wherein each path length (Lr) is selected from the range of 0.9* 7c *rl< Lr ≤7r *r1.