Z axis limit switches

I finally settled on using optical photo switches for all limit switches.  My reasoning is that optical switches should be more accurate and reliable than mechanical switches and there is no wear caused by friction as there is no contact.

After a bit of research on digikey, I settled for https://www.digikey.ca/product-detail/en/tt-electronics-optek-technology/OPB472N11/365-1646-ND/1636911 which are small, inexpensive and can be used for all axis (different orientation needed).  I then designed a base that I will glue the switch in 

 

Followed by adding the switches on the Z axis backplate and tweaking the Z nut adapter plate to provide barrier for the switches

 

I then proceeded to print the support and placed the order at Digikey.  

 

I should receive the switch tomorrow (March 22) and I’ll post the results…

Off for the night!

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