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A pattern of a pot rotary_knob_row = top_row - 30; working_width = width_mm - thickness*2.2; left_rib_x = 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; points = [ [right_edge, rotate_vector_sin * height], // top horizontal rib // h_wall(h=4, l=right_rib_x); // middle-bottom h.

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