Customizable mask strap ear relief

A super simple mask ear relief strap.

Unlike some other designs it does does not have any pointy and irritating prongs protruding from the edges. Instead, the tension is adjusted in the customizer before printing.

I recommend printing using a flexible material like nylon, ninjaflex, etc, since they're more comfortable than PLA. I printed in Dupont Hydrel but any soft or flexible material will do.