Observations on Dimension Change of Segmented 3D Printing Human Manikin Parts for Optimal Combination

Large objects, such as human-shaped manikins, need to be segmented for three-dimensional (3D) printing, and then glued. This paper presents quantitative and experimental results on filament dimension changes to show whether segmented parts can be combined using location-fit or magnets. Two kinds of filaments, poly lactic acid (PLA) and thermoplastic polyurethan (TPU), are used in the 3D printing of two types of test structures, a hole/shaft structure and a magnet-in-hole structure. Both horizontal and vertical filament dimension changes are measured. It was found that the hole sizes should be expanded to reflect the expansion of the wall thickness in the horizontal direction. In the vertical direction, the stacking of filament layers slightly reduced the total height. In particular, we derive an equation that can explain why the minimal thickness from slicing software g-code generation varied depending on the object inclination angle. Finally, the equation results are compared with those of slicing software.

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Observations on Dimension Change of Segmented 3D Printing Human Manikin Parts for Optimal Combination

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