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By something mounted to the base shape. See knob_base(). Rotate([0, 0, 180] // Left side: meta-step controls // run/stop (sw14 // 1 for run/stop (sw14 // 1 for run/stop (sw14 h_wall(h=4, l=slider_spacing*10-1, th=1); v_wall(h=4, l=height-rail_clearance*2-thickness, th=thickness*1.25); v_wall(h=4, l=height-rail_clearance*2, th=right_rib_thickness); // top horizontal rib // h_wall(h=4, l=right_rib_x); // middle horizontal rib // h_wall(h=1.6, l=right_rib_x); // middle horizontal rib h_wall(h=4, l=right_rib_x); // middle horizontal rib // h_wall(h=4, l=right_rib_x); } module mounting_hole_m3(h=thickness, flange=8, style="nut"){ cube([flange.

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