Monolith Ender 3 dual Z-axis aligner

Monolith Ender 3 dual Z-axis aligner inspired by 2001: A Space Odyssey.

I couldn't find proper tool to align my Z-Axis after installing dual Z-Axis mod for my somewhat modded Ender 3 Pro. The found solutions didn't quite fit for my use, some because of my mods and some were too cumbersome to set straight. So, I made my own.

 Monolith alignment blocks are easy to use and set up. Just drop them in 4040 aluminium extrusion grooves and push against vertical 2040 posts and you are ready to go. Just lower gantry gently on top of Monoliths. 

I usually just step with 0.1 increments towards Monoliths, but I don't recommend it to anyone. You may break something. Consider yourself warned!

Edit: I just noticed that this design cannot be used with original z-endstop.