Another Precision Adjustable Z Opto Endstop Holder
Description
A precision adjustable optical endstop holder for Prusa printers, with an integrated Z screw constraint bearing.
Instructions
Print and joint IT !
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License
Another Precision Adjustable Z Opto Endstop Holder by oTTo is licensed under the Attribution - Creative Commons license.

What did you use for the thin smooth bar? Just M3s, clamped upside down?
A list of hardware in the instructions would be helpful.