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{ cylinder(r=hole_r, h=thickness*2); echo("Putting a hole with radius: ", hole_r , " at ", hole_dist_side, hole_dist_top); echo("Putting a hole with radius: ", hole_r , " at ", hole_dist_side, height - 25; // build up seven rows; middle one unused row_7 = row_6 + vertical_space/7; row_3 = working_increment*2 + row_1; //special-case the top surface of the rail .

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