Ender 5 optical endstops

## IMPORTANT NOTE feb 21st, 2021

This project is finished enough to be used, I will not abandon it, but I will also no longer give it care and attention, unless specifically asked for!

Reason is, I have ordered a couple of 2209 drivers and will convert my ender 5 to sensorless homing.
This is because the Y-axis is missing about 6mm due to frame-constraints and the X-axis only has about 5 mm total clearance. I think, using the hard boundaries as endstops with sensorless homing, I can dial in the exact build-platform positions using software and therefore optimise build surface.

It might not be a smart plan, but at least I want to try :)

So; if you need changes to this Thing, help in implementing, or any other thing at all, JUST ASK.

## Update feb 21st, 2021

Created a new base (Y-axis part 1, v4) that uses an M3 T-nut.
Reason is that a regular nut that can be moved back and forth for adjusting the distance, also rotates in the channel, so it is nearly impossible to a