Screw Pen

A 3D-printable M12 screw pen that prints completely without supports.The design uses standard Pilot pen cartridges, which slide directly into the printed screw body. The dimensions follow a normal M12×100 ISO 4017 screw, so the model has the look and proportions of a real bolt.The download also includes a matching screw nut and a nut cap, allowing you to assemble a full screw set or customize the pen’s appearance.