E3D Auto Bed Leveling - DIY CHEAP

Can be used for Auto Bed Leveling, Mesh Bed Leveling, or Unified Bed Leveling.
Can be made under $10 using leftover E3D heatsink.

Uses carriage parts from thing #1438795 (https://www.thingiverse.com/thing:1438795) and the following:
o Printed/included Z Probe frame
o Optical enstop similar to: https://www.amazon.com/dp/B071KBC3P8/?coliid=I1OJR56XHKFB0T&colid=OR3I8G0KZVXE&psc=1&ref_=lv_ov_lig_dp_it
o Servo 9 gram model SG90 or equivalent
o 2.4 mm dia brass rod cut at 101.5 mm length and 20 mm length
o E3D Heatsink (leftover)