Outdoor Faucet Cover for Hose Bib
Uses a lot of filament, use some junky old roll of filament This outdoor faucet cover is easy to print and has an area to attach a rubber band inside that doubles as support while printing.
10% infill, 2 shells. Higher infill (within reason) will give you more sealed off airspace for insulation. I printed at 30% and it was a bit heavier than I expected (printed at about 92% scale). Remember that ABS does not like exposure to sunlight and may crack while printing tall objects. PLA is the best choice.
Uses a lot of plastic.