I have nothing bad to say about this design. There was a problem with the extruder motor when my CR-10 arrived, and, because I printed this cover on a different printer and installed it during the setup of the CR-10, it took me a while to troubleshoot the problem. But, I should have known better. Outside of that one issue, the fit is perfect, and the functionality is so...just...right...that I don't even notice it's there most of the time. Even when taking pictures of the upgrades I printed to post on Thingiverse, I had to go back and get a picture of it because I had forgotten it was there. If you ask me, that's an excellent design.