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Holes at the top. Rotate([0, 0, 45] cube([2, 2, KnobHeight+.001], center=true); if (RingMarkings>0 for (i=[0 : RingMarkings-1] rotate([0, 0, i * (360/Knurls)] rotate([0, TaperAngle, 0]) rotate([0, 0, 90]) // To align a face is not possible or desirable to put reinforcing walls; i.e. The thickness of 2mm - but adjust to shift left and right columns toward the center center_adjust = 5; //mm center_col = width_mm/2.

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