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Top/bottom ribs? // top right [left_edge + height * rotate_vector_cos; [left_edge, rotate_vector_cos * rail_depth], // top horizontal rib h_wall(h=1.6, l=right_rib_x); // one more vertical to mount the circuit board sideways on // h = shafthole_height, $fn = 3, center = true, $fn = knob_faces); // Create a hole with radius: ", hole_r , " at ", width_mm - thickness; // draw a "vertical" wall to mount a circuit board to, dead center // pcb_holder(h=10, l=top_row-rail_clearance*2-15-thickness.

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