Simple Ender 3 Auto Bed Level

This is an auto bed leveling system I designed for my Creality Ender 3 V2

I was inspired to make this by this Teaching Tech video: https://www.youtube.com/watch?v=hs6IVfNrf5k It also contains great information on how to set up the firmware to make this mod work.

Theory of operation: When the nozzle contacts the bed, the weight carried by the Z axis motor will be reduced lifting it, which will cause the limit switch to be released. A counter balance spring is used to reduce the pressure of the nozzle to bed contact. Two adjustment screws allow the counter balance and switch activation to be tuned.

Firmware changes are required!

Parts Needed:
5x46mm cap screw (1)
5x24mm cap screw (1)
23/64" x 1-3/8" extension spring (1)

After printing the parts:
The side plate to motor mount fitment may need sanded/filed as the tolerances are tight to prevent motor rotational movement. These parts must slide freely to allow switch to be actuated properly. It is a good idea to app