BFPTouch / Poor's man BLtouch Clone - best method for 3d printer auto bed leveling

BFPTouch - Poor's man 3D Printed BLtouch. A simple, cheap, neat, precise, compact and reliable any surface Z Proble for bed leveling, it's one of the most important 3d printer accessories and 3d print 1st layer enhancer Learn how to level your 3d printer's bed like a pro, Features - It can be used on all bed surfaces. - What you see is what you get during the working and setup. - High accuracy and repeatability (better then anything at least at this price range! ;-) ) - Lowest price possible with ready to buy products. (I had everything at hand...) Bill of Materials You will only need: - 1x Micro Servo (e.g. TowerPro SG90) - 1x Optical Endstop TCST2103 (RepRap Standard) - 2x M3x10 to fix the optical endstop. - 1x M3x30 as the probe - 2x self cutting screws (2x8) fix the servo -1x Cheap made in China gift pen spring that fits the M3x30 screw. Project On Thingiversa :2890290 Holder ht