I fitted the top cover and door on my Wanhao duplicator 4X this weekend. I noticed that the door did not stay open and it could go inside the printer when closed. So I did a quick design to fix both issues. I printed them at 0,2mm and 30% infill, they work well. I used some cheap double sided tape that has a foam centre to fix them to the printer. I tend to use this stuff for attaching stuff to RC planes and helicopters. In this application, it allows some springiness as the PLA is quite rigid. The door stop could have a little piece of rubber glued to it to soften the blow when closing the door, but in general I suspect this would be overkill as the acrylic sheet is quite thin and light. Print at your favourite resolution. Stick down with double sided adhesive tape. Just to clarify, the latch ( that's the longer bit) goes on the top cover so that it hooks over the front and over the handle when the door is UP. It works best if you use double sided tape with a foam core. If you cant get that, then maybe a couple of layers of double sided tape may lift it up a little more. Failing that print a plate about the same size as the "foot" of the latch about 1mm thick and stick that to the lid then the latch to the plate. I designed it the way I did because I knew the tape I was using added thickness. The door stop can go anywhere behind the door when its closed, its just to stop the door going too far in.