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To build up seven rows; middle one unused row_1 = bottom_row + v_margin + 12; //knob_radius top_row = height * rotate_vector_cos, rotate_vector_sin * rail_depth] // top horizontal rib h_wall(h=4, l=right_rib_x); // bottom horizontal rib // h_wall(h=4, l=right_rib_x); // one more vertical to mount the circuit board sideways on // h = hole_depth, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing; cylinder(r = 8, h = hole_depth, center = true); hole_depth = max(knob_radius_top, knob_radius_bottom, stem_radius) + nothing; cylinder(r = 8, h = knob_height, $fn = knob_faces); // @todo Refactor the scaling algorithm.

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