Soda Stream Corny/Cornelius Keg Holder
thingiverse
Sure you could just strap your CO2 to your keg, but this allows you to drop a bottle in and out without unstrapping it each time. Two parts, a ring for stability and a base for holding the bottle in place. I may have overdone the thickness of the parts, I've not printed it yet, but the openscad file is there if you want to have a play. I've allowed 63mm for the diameter of the sodastream bottle and 10cm thick for the body/ring. Let me know what infill settings you use if you print one!
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