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Top/bottom ribs? // top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom horizontal rib // middle horizontal rib // h_wall(h=4, l=right_rib_x); } module knurled_finish(ord, ird, lf, sh, fn, rn [ ord*cos(lf0), ord*sin(lf0), h0], [ ird*cos(lf1), ird*sin(lf1), h0], [ ird*cos(lf1), ird*sin(lf1), h2], [ ord*cos(lf2), ord*sin(lf2), h0], [ ord*cos(lf2), ord*sin(lf2), h0], [ ird*cos(lf1), ird*sin(lf1), h0], [ ird*cos(lf0.

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