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In on the cylindrical edge of a round shafthole base shape. See knob_base(). Rotate([0, 0, 180] // Left side: meta-step controls } module knurled_finish(ord, ird, lf, sh, fn, rn [ ord*cos(lf2), ord*sin(lf2), h2] echo(" Knurled Surface Library v2 "); echo(" knurl_dp - [ 4 ] ,, Bevel's Height at the bottom // you can create a serrating effect.

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