i3 Adjustable Z-Axis Micro Endstop
By Mak-a-face
Free
It's free to download
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Technical
What I used:
3 - M3x20mm & 1 - M3x15 bolts plus washers and nuts. 1 spring inside of a retractable pen that I cut in half. 2 - M2x12mm & Nuts for Micro Mechanical Endstop.
Free