U channel

I made a U channel for some of the N95 mask. I tested some by printing them in flex, and I gotten a hit or miss with them. Plus it kinda hurt wearing them no matter what you printed them in. So I made a U channel to go around the brim of the mask where it hits the face. Like it doesn't act as rubber since TPU can't. But it's flat, you can form it since it flex, and it's better than it was.

For normal mask I would say use any U channel. But for N95 and like mask I suggest using the flab version.

Print out of some flex like TPU. Infill doesn't really matter.