One Gallon Milk Jug Cap - Ribbed and Smooth Version
thingiverse
Fits standard US 1 Gallon Milk Jugs, or at least the gallon jug of iced tea I had around when making this fits perfectly. It's got a 38 mm cap on it. Grip version and smooth version available. This design doesn't leak from the seal or threads when held upside down. My current prints do leak through pores in the plastic, though. I'm planning to try printing with PETG and make sure there are no clogs to see if it seals fully watertight. Printed with Blue PLA.
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