Defaultly sized to fit a Prusa Mini, at 7 inches. Keep in mind the square-cube law when increasing size 200%, the water volume (weight!) increases 800%!
Print in the orientation shown in pictures (for no supports) with 4 perimeters (at 100% scale), and 25% infill. This will print the walls solid and only use infill in the handle.
The watering can comfortably holds 3 cups of water.
Credits:
bobmakes