Supports highly recommended.

I printed mine without, but the bottom and the "ceiling" turned out a bit rough. Had to do alot of cleanup, and pretty much drowned it in acetone to get it nice looking in the end :-) Turned out much better than I had dared hope though :-)

Now I just hope the birds will like it just as much as I do :-D

Note: The two holes in the back of the top is for mounting a string. It's supposed to hang in a string, fastned 3 places - two in each side of the "cage" front top, and one in the rear holes.

The five holes in the bottom is to allow rain to drain out.

I think I pushed Tinkercad pretty close to it's limit with this one - it was quite slow to work with in the end, and it took about 10 attempts to download the stl without getting hit by a "bad gateway" error :-)