Bottle Mate

Coupler for filling soda bottle bird feeders. Cut off one bottle to use as a funnel.

Optimized design derived from PCO 1881 Neck Finish Standard. If you find it too tight, scale up in X/Y dimensions to suit your taste or bottle. In ABS on my FFCP, 101% is good, 102% is loose. Thread pitch is 2.70 mm, so you should leave Z alone unless mating with another standard.

See my original PCO 1881 Cap Design (Thing #1685815) if you want to modify this thing.