I took the super-useful original design (made by TheCase) and scaled it down - with some trial and error - to fit around a half-size growler (32-oz) mouth.
Original (64-oz Growler size): https://www.thingiverse.com/thing:1122092
Printer Brand:
Printer:
Rafts:No
Supports:
No
0.2mm
Infill:
5
The author remixed this model.