BFPTouch micro - Poor's man BLtouch - micro version

thingiverse

This is a remix/redesign of an outstanding design from Bruno Porto. I simply reconfigured the components to fit 3.7g micro servo instead of the original 9g. It's intended for use with 2mm rod (bike wheel spike) threaded onto the end, and the length of the rod should be between 30-35mm depending on your printer setup. Gravity is relied upon to drop the probe, and a ring + spring setup can be added if you prefer a reliable and always positive drop action. The reaction arm of the servo may need some scaling or boring to accommodate your printer's precision, as the hole is quite small and requires a tight fit with the servo. My angles are 70/180 degrees for deploying/stowing the probe. I sourced the micro servo from Banggood: https://www.banggood.com/3_7g-Micro-Analog-Servo-GH-S37A-For-RC-Airplane-Helicopter-p-1116559.html?rmmds=search&p=UN1003814241201410X7 Additionally, I used brass M3 inserts assembled with a soldering iron to mount it from the top: https://www.banggood.com/100pcs-M3x5x5mm-Metric-Threaded-Brass-Knurl-Round-Insert-Nuts-p-1050182.html?rmmds=search&p=UN1003814241201410X7