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Ergonomic ear saver / ergonomisch mondmasker spanner achter de oren
Ultra light and more ergonomic ear saver for your face mask.
As little material as possible, no annoying bumps/potrusions, and room for txt / sponsoring / ....
Source inventor 2020 file also incuded if you want to modify it yourself.
You'll probably want the _blank model for printing. Examples with text included.