Face Mask Strap

Perhaps a bit late - but most / all other face mask straps are pretty badly designed.
They tend to need retractions / travel moves, require infill on the tips, or have infill meet perimeters in strained areas, reducing durability.

This strap is designed to be printed with perimeters only, allowing for single line extrusions around the entire part - adding durability and reducing potential issues with stringing when printing multiple straps at once.

The size and spacings of the knobs holding the bands are roughly similar to
https://www.thingiverse.com/thing:4249113

Make sure to print it such that there's an even number of perimeters along each knobs - you may need to change your extrusion width slightly.

Edit: Added a "straight" version which can completely forgo infill.