A working step up rubber gun. Matteo di Domenico (teodido) has developed a 3D model, and I've printed it. Our idea was not so original!. In fact RBGuns has created an original design, made of wood, handmade. RBGuns - https://www.youtube.com/user/RBgunsWe have printed the files with a Sharebot pro. ABS. layer: 0.2mm. We have used a raft.