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螺栓、螺母、螺紋桿 - OpenSCAD 庫(kù)螺紋. scad

螺栓、螺母、螺紋桿 - OpenSCAD 庫(kù)螺紋. scad
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I needed some threaded rods and didn't find a good library here. As OpeCAD is not well enough equipped to do threaded stuff having small slope, I decided to write my own code, using some sweep() functionality I had published earlier with my Naca_sweep.scad library.
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