// Round futon roller // by Derek Quenneville // // Object source: http://www.thingiverse.com/thing:66510 // // Measurements: // 25.5 mm outer diameter // 15.8 mm height // 9.5 mm inner ring diameter $fn = 100; outer_d = 25.5; outer_r = outer_d / 2; height = 15.8; inner_d = 9.5; inner_r = inner_d / 2; difference() { cylinder(r = outer_r, h = height); cylinder(r = inner_r, h = height); }