Compass

4 diffrent versions of the same tool. The "Extra complex" one has a lot of 3D printed threads, so print it with the highest quality you can and with a high infill and/or wall count. I used 0.12 mm quality, 30% infill, and 4 walls with normal support everywhere except in the threads in Cura, and it worked perfectly. It also has interchangeable tips, with an optional pen-tipped one.