bubble ring
thingiverse
A bubble ring for aquarium. For an aquarium air hose with 4mm inner diameter. On Github: <https://github.com/armin-fx/bubble-ring> __3D printing__ Only use aquarium save filament _and_ colors. for example: - PLA - natural/transparent - PET transparent - the more you can trust a manufacturer the better, also don't use recycled filament.
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