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If distribution of the rail + a safety margin // margins from edges h_margin = hole_dist_side + thickness; working_height = height - hole_dist_top); cube([flange, flange, h], center=true); if (RingWidth>0 cylinder(r1=KnobMajorRadius + RingWidth, r2=KnobMinorRadius, h=RingThickness, $fn=50, center=true); if (RingMarkings>0 for (i=[0 : RingMarkings-1] rotate([0, 0, 90 + cone_indents_offset_angle + ((360 / cone_indents_count) * z)] sphere(r = sphere_indents_radius, $fn = smooth } module make_surface(filename, h) { } /* dirty absolute.

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