This is a fitting for a K40 laser so that the hole that gives you access to the USB port is not so empty looking. I had to trim up the flanges and glue one of the clasps that broke with super glue. It would probably be tougher if you used flexible filament.
any PLA, Flexible PLA, PETG
I have only tried it with PLA but one of the clasps broke and therefore I think flexible or PETG would be better.