My daughter wanted a fidget spinner and I happened to have a 3D printer and an old skateboard…
She doesn’t really have the patience to “finish” projects, so one of them (hers!) is rough and pretty much straight from the printer. Which makes a difference - something like a spinner really wants to feel nice in your hands. So you let the printer run a couple hours to make the spinner, then another several hours with different grits of paper to get it nice and smooth. Or not.
Actually, this was a good lesson on a couple of levels. I’m an artist and a bit of a perfectionist. I really wanted my daughter to inherit that trait - of not wanting something out in the World that didn’t represent you at your best. But she isn’t like that. For her, the enjoyment was the doing, and once the doing was done that was that. So I learned a lesson about not imposing your own values on your kids.