Printrbot Simple Maker's Kit Model 1405 3D Printer, 4" x 4" x 4" Maximum Build Dimensions, 100 Micron Maximum Resolution, 1.75-mm PLA Filament Fabricates parts up to 4 x 4 x 4 inches (H x W x D) in size or 64 cubic inches in volume Prints layers up to a maximum resolution of 100 microns Fabricates parts using 1.75 mm PLA filament (sold separately) Automatic leveling probe helps create a level print Cooling fan speeds up solidification of the extruded filament Aluminum extruder and print bed with 4" x 4" x 4" build volume Semi-auto leveling via software GT2 belts, GT2 pulleys and aluminum Z coupler for increased rigidity Includes LM8UU bearings Compatible with the 8mm diameter smooth rod