Adjustable headband

Since I had no rubber band for the Prusa face shield to hold on my head, i designed this adjustable headband.

The middle part has to be fixed to the bottom part by sticking a soldering iron (or a similar hot pointy thing) through the 3 holes of the middle part into the bottom part - and "welding" along the two round walls on the bottom part and the middle part.

Also you need to poke through the hole in the wheel and clean it out.

The "strap_for_face_shield" file fits onto my remixed Prusa face shield you can find here: https://www.thingiverse.com/thing:4301727