This is a 3d design of a pen that works uising a embedded solinoid instead of the ussual boring spring. It runs on 3 batteries. As the button is pressed current will be allowed into the coil moving the metal base of the pen into the second position allowing the ball point tip to extend out of the pen. I have worked on the actual prototype but have not fully completed it yet
STL (Stereolithography, filesize: 4.83 MB), OBJ (OBJ, filesize: 9.63 MB), SKP (Sketchup, filesize: 13.6 MB), F3D (Autodesk Fusion 360, filesize: 927 KB)