Core-Shell Tube FDM Printing for Weight Reduction
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Solution Overview
Problem
Current 3D printing methods using FDM are inefficient in reducing the weight of printed items while maintaining structural integrity and smooth surfaces, as they rely on solid materials with high material usage.
Innovation Solution
The method involves using a core-shell-shell structure with a hollow tube core and two shells, where the hollow tube is printed alongside the 3D printable material, allowing for layer-wise deposition to create a lightweight 3D item with a core-shell-shell layer, using a standard FDM printer with a core-shell nozzle and a cutting element to manage the hollow tube's presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If solid materials are used in FDM printing, then structural integrity is maintained, but weight and material usage increase
Solution Approach 1:
The printed item is segmented into multiple hollow tubes arranged in parallel, replacing solid material with a structured assembly of hollow elements. This segmentation maintains structural integrity through the collective strength of multiple tubes while significantly reducing overall material usage and weight.
Solution Approach 2:
The invention uses hollow tube structures with empty interiors, creating a porous-like configuration that reduces material density by up to 30% compared to solid materials. The hollow tubes provide structural support while minimizing material consumption, achieving both weight reduction and maintained strength.
2Quantity of substance
If hollow tube structures are used to reduce material density, then weight is reduced, but manufacturing complexity increases
Solution Approach 1:
The hollow tubes are nested within the 3D printable material matrix, with the tubes positioned inside the extruded material. This nested configuration allows the complex hollow tube structure to be integrated within a simpler outer material shell, reducing overall manufacturing complexity while maintaining the material reduction benefits.
Solution Approach 2:
The invention creates a composite structure combining hollow tubes with 3D printable material, where the two materials work together to provide both structural support and material efficiency. This composite approach simplifies the manufacturing process by using standard FDM technology with modified material feeding, rather than requiring entirely new manufacturing methods.
3Quantity of substance
If hollow tubes are printed layer-wise, then material usage is reduced, but surface smoothness may be compromised
Solution Approach 1:
The 3D printable material is applied locally around the hollow tubes, with varying thicknesses in different regions. The material density and distribution are optimized locally to ensure surface smoothness in visible areas while maintaining material efficiency in less critical regions. This local quality adjustment preserves surface appearance while achieving overall material reduction.
Solution Approach 2:
The hollow tubes extend in the vertical dimension through multiple layers, providing structural support that reduces the need for excessive horizontal material layering. By utilizing the vertical dimension effectively with continuous tubes, the invention reduces overall material usage while the outer 3D printable material layers maintain surface smoothness through proper extrusion and fusion.
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 reduces the material density by up to 30% compared to solid materials, maintaining structural integrity and surface smoothness, while allowing for the creation of lightweight 3D printed items with customizable properties.
Implementation Method 1
a 3D printing stage comprising layer-wise depositing core-shell-shell material via a printer nozzle
Implementation Method 2
the filament is melted and extruded before being laid down
Implementation Method 3
FDM works on an 'additive' principle by laying down material in layers; a plastic filament or metal wire is unwound from a coil and supplies material to produce a part
Data Source
Figure 1A~1B
Figure 1C
Figure 1D~1E
AI summary
The invention provides a method comprising producing a 3D item (1) by means of fused deposition modelling using a fused deposition modeling 3D printer (500), the method comprising a 3D printing stage comprising layer-wise depositing core-shell-shell material (1201) via a printer nozzle (502) on a receiver item (550), wherein the core-shell- shell material (1201) comprises a hollow tube (1210) comprising a hollow core (1220) and a first shell (1230) enclosing the hollow core (1220), and 3D printable material (201) at least partly enclosing the first shell (1230), to provide the 3D item (1) comprising a core-shell- shell layer (1322), wherein the core-shell-shell layer (1322) comprises the hollow tube (1210) comprising the hollow core (1220) and the first shell (1230) enclosing the hollow core (1220), and 3D printed material (202) at least partly enclosing the first shell (1230).