Respirator cutter pattern

This is plastic cutting tool for DIY respirator. The shape matches the respirator from this site.
https://www.sartor.cz/content/66-jak-usit-rousku (Sorry, the page is in Czech language)

The original pattern was a "S" size so I has stretched it to 115% to match it with my M/L size European head.

The best practise is to cut the fabric directly with roller cutter all around the edge of the tool. If you don't have a roller cutter, this tool can also serve as pattern for pen or marker with better grip on the fabric.

Fantastic tool for making "laces" for respirator is this thing https://www.thingiverse.com/thing:3880491

Edit:
Added Universal size rectangular Mask cutting pattern
https://daya.cz/blogs/news/jak-usit-klasickou-a-detskou-dvouvrstvou-bavlnenou-rousku
(sorry czech web page again)