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= sphere_indents_radius + (enable_stem ? Stem_height : 0) + knob_height - sphere_indents_cutdepth; for (z = [0 : sphere_indents_count]) { z_position = height * rotate_vector_cos; [left_edge, rotate_vector_cos * rail_depth], // top horizontal rib // middle horizontal rib h_wall(h=4, l=right_rib_x); // middle-bottom h rib // one more to mount a circuit board to, dead center pcb_holder(h=10, l=top_row-rail_clearance*2, th=1.15, wall_thickness=1); // lower h-rib reinforcer.

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