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Top left [left_edge, 0], // drop to axis [left_edge, -extra_depth], // bottom right [right_edge, rotate_vector_sin * rail_depth] // top horizontal rib // bottom horizontal rib h_wall(h=1.6, l=right_rib_x); // middle horizontal rib h_wall(h=4, l=right_rib_x); // middle-bottom h 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, 45] cube([2, 2, KnobHeight+.001], center=true); cube([RingWidth*.5, MarkingWidth, 2], center=true); cube([8, 3, KnobHeight], center=true); if (Divot==2 } if ($rel[0] == '/') { } module make_surface(filename, h) { for (a = [1, 2, 3.

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