I downloaded a model but the Homer had several model flaws and the sponge base didn't fit my sponges so I designed my own. I basically kept only the spout.
I started with a PNG of Homer disappearing into the bushes. I cleaned it up a lot in gimp, then used adobe's PNG to SVG converter, which I'll say works very well. Brought that into inkscape and cleaned it up even more. Separated him into colors, pulled them into tinkercad at different heights, then printed him with 4 color changes.
Don’t quote me on this, but I don’t think they are legally able to sell prints or STLs because it’s copyrighted content. It’s why you see those super detailed Star Wars models for free.
It depends which country you're in. Most countries don't give a shit about copyrights, and you'll find people openly selling copies of popular movies from pushcarts