There are a lot of things about thingiverse I like, not the least of which is all the stuff I've designed. PirateBay has a physables section which I won't link to since their ads aren't exactly family friendly. There's Physible Exchange, which rose out of annoyance at Thingiverse's TOS.
And now there's Cube Hero.
lets you see your changes graphically! Because if you're gonna compete with Thingiverse you need a reason to draw people in. That might be enough for me. Plus it's got, in my opinion, a better non-gag chess set than any on thingiverse.
Give Cube Hero a try.