a mount for the Mars 4 Ultra, lets you drain some of the resin off before cleaning with IPA

print in TPU or PLA, if you print in PLA you'll need to heat up the mount and ad a very slight bend to the middle to get the build plate on an angle to help with drips forming on the corner of the plate and also to line it up with the resin vat, if you print in TPU the flex of it will naturally sag down and do this by itself

if printing in PLA the tolerances are quite tight, you may also need to heat up the mount area of the build plate with a heat gun and slow push the drip mount into it, slightly deforming the corners of the print to fit in smoother.