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(HP h_margin = thickness*2; v_margin = hole_dist_top*2 + thickness; width_mm = hp_mm(width); // where to put reinforcing walls; i.e. The thickness of the object. // If you don't want a D-shaped shafthole cross-section. 0 to keep it round. [mm] shafthole_cutoff_arc_height = 0.35; /* [Stem (optional)] */ // Create a round shafthole base shape. Cylinder(r = shafthole_radius, h = knob_height, $fn = top_rounding_faces); // Straight basic stem. Cylinder(h = stem_height + nothing, = stem_radius, r2 = stem_transition_radius, $fn = knob_faces); // @todo.

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