Dennerle Bio-CO2 bottle holder
thingiverse
I wasn't happry with the original bottle holder made of paper that came with the Dennerle Bio-CO2 set for my aquarium. So i made this simple bottle holder which secures the small bottle (for counting the bubbles) to the big CO2 reactor bottle. My printed one fits perfectly tight to the small bottle. Depending on your printer maybe you have to enlarge/shrink the model 1-2% in your slicer. Have fun.
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