Soda bottle airlock (beer / wine / cider brewing)

thingiverse

This is a simple air lock that fits common soda bottles. When home brewing I want to experiment more. I need a way to separate some beer into smaller batches so I can try new things, like dry hopping, different yeasts, other additives, various fermenting temperatures, etc. To make this happen, I've created an airlock that screws onto regular soda bottles. I recommend using water bottles since they have no flavor in them unless you're going for a cola aged IPA or something similar. I printed this (check the pictures; my printer needs a little tuning) but I haven't tested it yet. I hope you have fun and get good results with it. Let me know how it goes! Edit: The current design needs some supports, which I'll adapt later in the week to eliminate them and make it less prone to leaking. Use a rubber washer at the bottom for a tight seal.