This ruler is based on the Voron Ruler with the logo changed. Source code for that ruler is here and is licensed under the GNU GPL V3: https://github.com/hartk1213/MISC/tree/main/PCBs/Voron_Ruler_PCB
TH3D PCB Ruler – Metric & Imperial, Wire Gauges, Screw Sizes, RPI Pinout, Ohms Law
Want a nice ruler to keep around the workbench for quick references and measurements? Check this out! This was made for us by one of our customers in our Discord server (thanks Apulo!) and he sent us a batch of them. These are accurate and have a bunch of handy references for solid wire diameters, ohms law formula, Pi GPIO pinouts, and more!