Support free Dave valve (covid oxygen mask) - Base redux
thingiverse
I started from the very nice model by fede27 (https://www.thingiverse.com/thing:4250394) which was based on the wonderful project https://www.isinnova.it/easy-covid19-eng/. The model is practically identical to the original, except I reduced the diameter of the main hole (the one that connects to the Charlotte Valve) by 98%, for a tighter grip.
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