Ruler made from a printed circuit board based on Hartk1213's design. Due to the technology, it's more of a fun gag, which includes some useful inscriptions, formulas, and for example the PI4 GPIO pinout. It can also be used to check the diameter of metric screws and wires.
The source of the PCB:
github.com/hartk1213/MISC/tree/main/PCBs/Voron_Ruler_PCB
