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BackThe -y axis, where the stem radius adapts at the center, then to point at the top. Cylinder(r = shafthole_radius, h = knob_height, $fn = top_rounding_faces cylinder(h = stem_height + nothing, = stem_radius, $fn = smooth } module knurled_finish(ord, ird, lf, sh, fn, rn [ ord*cos(lf2), ord*sin(lf2), h2] ], triangles=[ [0,1,2],[2,3,0], [1,0,4],[4,0,7],[7,8,4], [8,7,9],[10,9,7], [10,7,6],[6,7,0],[3,6,0], [2,1,4],[3,2,6],[10,6,9],[8,9,4], [4,5,2],[2,5,6],[6,5,9],[9,5,4] ], convexity=5); } } // h[p] function hp_mm(h) = h * HP; Sat 28 Aug 2021 07:18:14 PM EDT