That's awesome! Do you have any pictures of some favorites that you've made?
Re: building a business vs. the joy of doing something, I think that a major reason that this is the first of my creative ventures that I am actually attempting to properly monetize is that 3D printing is virtually zero effort, as far as production is concerned. Sure, it takes some time to make good designs, but I can just press "go" on the printer and more or less leave it be for the next 6 hours, and once I have a design I like I can just keep printing it for as long as people keep buying it. The actual labor is pretty much front-loaded. I don't have to worry about a day where I don't have the energy to make a product to sell like I would with sewing, or even music. It's just a matter of making sure the machine works.
It's funny, because with sewing or knitting I always enjoy the act of making things so much, but as soon as I have a deadline or a paying customer, it becomes torture and I wish I had a machine that could just do it all for me. And now I do (at least until it falls apart from overuse...)