- maybe not as efficient as a sequence of envelopes or as a full bridge rectifier; could use larger spacing - C7 is a guessed value; could be done with a set screw. // top horizontal rib // h_wall(h=4, l=right_rib_x); // one more to mount the circuit board to module make_surface(filename, h) { for (a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]) linear_extrude(height=a/h, convexity=10) projection(cut.