Anycubic I3 MEGA optical z-Endstop

You need a couple of M3 screws and nuts to mount all the parts.

I have used this endstop: https://www.amazon.de/dp/B01B4FV0HQ

You have to cut the paddle to the size of your need.

For the second endstop you need to flip the holder and the paddle in your slicer.

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I have added an untested (!!!!) version of the endstop holder (new), which can be mounted to the stepper screews.