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/ (8+tolerance/3); // generally-useful spacing amount for vertical columns of stuff col_left = thickness + 6 + tolerance; rotate_vector_cos = 0.94; // 'x' of 20 degree rotation rotate_vector_sin = 0.34; // 'y' of rotation left_edge = -rotate_vector_sin * rail_depth; right_edge = height * rotate_vector_cos, rotate_vector_sin * rail_depth] // top horizontal rib // h_wall(h=1.6, l=right_rib_x); // bottom right [right_edge, rotate_vector_sin * height + rotate_vector_sin * height + rotate_vector_sin * rail_depth] // top horizontal rib // one more vertical to mount a circuit board sideways.

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