Magnetic Z-probe semi-automatic

The "hex-key" Z-auto probe sucks.... at least mine did.
I designed this to use with an 8mm diameter x 3mm magnet.
I attached a small metal tab on the bottom of my effector for this to mount to when I want to "calibrate" the flatness of my Kossel Mini bed.
It uses the standard micro switch only.... no other moving parts.
I get great prints using this.
Make sure to install the switch with the roller tip under the magnet, to prevent any wobble/tipping.
The magnet is epoxied in.
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