Printrbot Assembled Simple 2014 3D Printer, PLA Filament, 1.75mm Ubis Hot End, 4" x 4" x 4" Build Volume Fabricates objects from G-code instructions using PLA thermoplastic filament Open platform for ease of access with machined aluminum and laser-cut birch wood frame construction Builds objects to maximum dimensions of 4 x 4 x 4 inches/102 x 102 x 102 mm (H x W x D) Vertical (Z-axis) resolution of 100 microns (0.10 mm) 6061 aluminum print bed provides a level build surface that will not warp