FreePCO1881 / PET / soda bottle air lock
Thingiverse
14 model
Free
FreeWide-Mouth Mason Jar Fermentation Lid with Weight Plunger (Airlock + Fridge Versions)
Printables
Free5L glass jar lid for fermentation airlock
Printables
FreeGrowler Airlock Bung
Printables
FreeIKEA 365 fermenter
Printables
FreeAir lock for brewery and fermentation
Printables
FreeCustomizable Bubbler airlock
Printables
FreeMason jar lids and airlock for fermentation
Printables
FreeSoda bottle airlock (beer / wine / cider brewing)
Thingiverse
FreeAirlock cap
Printables
FreeAirlock Sign Semiotic Standard from Alien WIP
Thingiverse
FreeFerment Air Lock
Thingiverse
FreeDewalt Airlock adapter for 1.5in Vacuum hose
Thingiverse
FreeDewalt Airlock Router Fence Dust port
Thingiverse