The unique features of our Potterbot 3D PRO 9 printers is the ability for direct extrusion of real clay. Other brands use a compressed air system printing slip (watered down clay or alcohol diluted clay). The advantage of direct extrusion is printing full body clay, or other paste-like materials. Our 3D Potter ceramic printers use high quality anodized aluminum rails, which are robust and have a smooth surface for easy movement of the parts, allowing our printers to withstand classroom and industrial environments. All materials used to build our printers are food grade, so get creative.