Optima rebreather keychain
thingiverse
Just a rough file created on tinker CAD. Another diver asked me to make a simple keychain that looked like an Optima rebreather, and this was what my limited abilities came up with. Note: the back side with the keychain hook is all in the same plane. I haven't printed it yet, but I would lay it flat on it's back and print at a high infill setting.
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