This is a X gantry leveling jig for the Ender 3 Max. Sometimes my dual Z get's misaligned and then I need to readjust. Instead of crashing it into the top frame, I always opted for this jig.
First make sure your Z axis is somewhat high up, so you can get the jigs underneath. Now place both pieces on the bottom extrusion with the cutout on the top part facing inwards towards the X gantry. Now carefully move the Z stepper motors down and readjust the jig so they fit perfectly under the gantry. If they are close to touching the printed part, I usually move the Z axis down by 10mm, which will crash the gantry on top of the jig.
You might have to do 10mm once more in case of a bad misalignment. But usually once is enough.
This is a remix of a remix. Find the original authors on thingiverse:
Original author (Wes_3D_Prints): https://www.thingiverse.com/thing:4907636
My model derived from this (Louise Paisley): https://www.thingiverse.com/thing:4963474
Improvements I did on this model:
The author remixed this model.