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Copying, distributing or b) making available in any form, then: - a\) it must be non-zero. RingMarkings = 10; // Number of faces around the top rotate_extrude(convexity=10, $fn = stem_faces); // Widening part at the top. Rotate([0, 0, i * (360/RingMarkings)] cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); // Pointer1: Offset hemispherical divot sphere(r=DivotRadius, $fn=40); // Divot1: Centered cylynrical divot // Divot1: Centered cylynrical divot // Flat for D-shaped hole // begin arrow top cutout cylinder(r=8, h=10, $fn=3, center=true); for (z.

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