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Rib pcb_holder(h=10, l=top_row-rail_clearance*2-15-thickness, th=1.15, wall_thickness=1); // Create a round shafthole base shape. See knob_base(). Rotate([0, 0, 90 + sphere_indents_offset_angle + ((360 / cone_indents_count) * z)] sphere(r = sphere_indents_radius, $fn = knob_faces); // Create a round shafthole base shape. See knob_base(). Rotate([0, 0, 90]) // To align a face with the rest of the indenting cones, measured from.

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