An Algorithm for the Removing of Offset Loop Twists during the Tool Path Generation of FDM 3D Printer

다국어 초록 (Multilingual Abstract)

Tool path generation is a part of process planning in 3D printing. This is done before actual printing by acomputer rather than an AM machine. The mesh geometry of the 3D model is sliced layer-by-layer along theZ-axis and tool paths are generated from the sliced layers. Each 2-dimensional layer can have two types ofprinting paths: (i) shell and (ii) infill. Shell paths are made of offset loops. During shell generation, twists canbe produced in offset loops which will cause twisted tool paths. As a twisted tool path cannot be printed, it isnecessary to remove these twists during process planning. In this research, An algorithm is presented to removetwists from the offset loops. To do so the path segments are traversed to identify twisted points. Outer offsetloops are represented in the counter-clockwise segment order and clockwise rotation for the inner offset loop todecide which twisted loop should be removed. After testing practical 3D models, the proposed algorithm isverified to use in tool path generation for 3D printing.

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