I always like this ear saver design but I found it a little short for my giant head. The cat face is fun and acts as a small spring in the middle.
Surgical masks and a number of n95's have loops that are too short for me to use with most earsavers. I also have ears that straps want to slide off of. So I decided to redraw my favorite earsaver to make it what I need it to be.
This will fix on a bed < 200mm in width (or length). If your bed isn't quite that big, try rotating the model 45° so it runs corner to corner. Pythagoras may give you the space you need.
Changes
Update 6/4/22: New STL with reinforced mask holds
The author remixed this model.