Mechanical Endstops for Z Axis Alignment

My sagging x gantry on my Ender 3 V2 has always been causing me problems and I've been getting tired of leveling it. So I got a dual z stepper kit! I have a BLTouch but didn't want to get a new 5 driver main board to take advantage of Marlin's Z stepper auto-alignment (G34). So I was looking for solutions with just my stock Creality 4.2.2 board.

I remembered Prusa printers just use a forced mechanical alignment (now depreciated M915 command in Marlin) so wrote up my own gcode script, printed some mechanical endstops and now have a perfectly level x gantry every time. You can actually see the gantry level itself in the video!

Note that these mechanical endstops are made so that a traditional Ender 3 CANNOT reach them (they are above the 250 mm height limit). A special gcode script will need to be used to get rid of the software endstops. (https://www.reddit.com/r/ender3v2/comments/oy0sct/calibrating_dual_z_steppers_prusa_style/h7pttyc?utm_source=share&utm_medium=web2x&context=3)

There are 4 STLs available, depending on what size screws you have (M3 or M4) and if you have t-nuts available:

1. "Top Mechanical Endstop M4.stl" (Recommended)
   • (x4) 18 mm M4 screws
   • (x4) M4 t-nuts
2. "Top Mechanical Endstop M3.stl"
   • (x4) 18 mm M3 screws
   • (x4) M4 t-nuts
3. "Top Mechanical Endstop (with Rail) M4.stl"
   • (x4) 18 mm M4 screws
   • No t-nuts needed
4. "Top Mechanical Endstop (with Rail) M3.stl"
   • (x4) 18 mm M3 screws
   • No t-nuts needed