Printrbot Simple XL Upgrade Kit Kit to increase build volume to maximum dimensions of 7.28 x 3.9 x 6.5 inches/185 x 100 x165mm (H x W x D) Works with the Printrbot Simple 3D printer (sold separately) Laser cut wood pieces and rods to add height and stability to printer tower Includes laser cut plates for print platform and print bed, and a Y-motor extension Assembly required