Designed and printed this before I even used the Photon Mono 2 since I didn't feel like cutting a notch in the lid to clear the mini heater cable. 6mm tall with a 1mm tall inner lip in the corners that holds the top cover more snug than the stock nylon hardware does. The same screws are reused for mounting and the tabs shouldn't overlap the screen protector in the uploaded versions.

File "Mono 2 lid seal.stl" does not have a hole in the rear middle in case you don't need it or want to place it in another spot, add additional holes etc.