Syndaver did a great job creating this simple and elegant PTFE Cutter (https://www.thingiverse.com/thing:4549804)
Because I don't need it as a keychain, I decided to make one larger and more robust. I think it's easier to handle and more reliable.
I also added slots for a more angled cut besides the 45 and 90 degrees.
I was designed for a PTFE tube with 4mm OD and 6mm thick blade.
Feel free to change remix it to attend your needs.
PLEASE: Consider posting a making, this helps a lot
Say thanks by giving a tip and help me continue to create and share.