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mount and trigger for optical limit switch

by i-make-robots

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I have a Prusa 2 with a z limit switch. every time the machine touches the switch it gets bumped a little bit out of alignment. I needed a switch that never got touched so it would stay where I put it.

[Get the same switch here](https://www.marginallyclever.com/product/touchless-3d-printer-endstop/) **no longer available**

[See calibration here](https://www.youtube.com/watch?v=KpP7NQRpU3A)

Bonus I didn't realize early on: when very very close to correctly tuned the LED on the switch f

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