FYSETC VORON 0.1 HARTK Z AXIS ENDSTOP MICROSWITCH PCB Motherboard 720324A-Y2-210908 Switch Hartk Sexbolt Limit switch https://github.com/hartk1213/MISC/tree/main/PCBs/Microswitch_Z_Endstop  this Z axis endstop microswitch PCB makes wiring the Z axis endstop easier, cleaner, and more serviceable. Features a built-in genuine OMRON micro switch.   See the Github documentation here to download the latest .STL files to support this upgrade.