Prints in 3 parts for easier color changing:
No supports needed. There are holes to fit the parts into each other. Post screws in using M3 to the birdhouse by @michelem.
*an earlier version in the photo uses magnets. That's still a WIP.
The author remixed this model.
Separated the Classic Mailbox into 3 parts, and added holes for easy fitting / printing in different colors.