CNC 1610 TLO switch holder
thingiverse
One of the side-effects of [adding bed risers to my CNC](https://www.thingiverse.com/thing:3565556) is that I can pass the front edge of the bed slightly, which makes it a convenient place to mount a microswitch to use as a tool length offset probe. This mounts to the front, slightly high to allow for a printed sacrificial bed and PCB bracket, with some wiring channels off either side. It's wired in parallel with the Z probe (A5 on a typical GRBL board). For tool changes in software this works perfectly for milling PCB's with a combination of pcb2gcode and bCNC; YMMV with other stuff.
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