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Fine Adjusting Z=0 Switch for 3D Printer
Uses a lever to make a 32 TPI screw look like a 250 TPI screw to allow fine adjustment of the Z=0 position.3D printer parts and enhancements
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This Z=0 switch uses a lever mounted on a HDD bearing to allow very fine control of the Z=0 position in a 3D printer. The lever effectively multiplies the adjuster screw TPI by about 8, making a 32 TPI screw look like a 250 TPI screw. One full turn of the screw will move the print bed about 100 um.
There is a small magnet on the end of the lever to keep the lever in contact with the adjuster screw.
Video of the operation here:
Materials and methods
I used ABS to print the switch components. It will require some #6 plastic screws and a #6-32 adjuster screw. Get the bearing from a HDD. The magnet was one I happened to have in my parts box.