This is a Glo Hyper X2 Air case designed to be printed in  TPU. It protects your Glo device while still giving you access to both buttons as well as the charging port. There's also a cut for the air intake, so you can leave your Glo Hyper X2 Air in the case while actually using it.

You might get away with using other materials, but I have not tried anything other than TPU. Should work with any flexible material though. As for rigid materials like PLA, PETG, ABS and so on, I don't think it serves the original purpose of the model (protecting the device), but, of course, you can do whatever you want.