First of all I want to thank thingiverse user perolalars for creating and publishing this awesome step file of the vat: https://www.thingiverse.com/thing:4754895
I used it as a template and the dimensions are spot on.
I was a bit surprised that there doesn't seem to be a Vat lid for the Mono X available that also attempts to seal off resin smell. I only found several covers that are placed onto the vat that shield it off from uv light.
It's essential to print it out of TPU, to get that extra “grippy” seal function. I haven't tested it in PLA or sth. different, it may not fit well.
I printed it with 0,6mm nozzle but it should also work with other sizes.
The author remixed this model.