Elastic Headstrap for Protective face shield / COVID19

I made an elastic remixed idea from
https://www.prusaprinters.org/prints/26330

But I design this for FLEX filament printing an d optimized design.
I used Ice Filament FLEX which has high shore (== not so flex)

This could be sterilize at 70degree.

This design is compatible with the face shield design I prefer which is https://www.prusaprinters.org/prints/27356-headband-europa-a4a (A4 PETG) or his other design https://www.prusaprinters.org/social/53302-peter-m/prints

(congats @Peter M for such perfect design! with fast print)

Print instructions

220 degree for nozzle, 0.30 mm per layer. Nearly Prusa slicer FLEX filament setting except temperature.