Well, Blender acts as a Slicer in this case ;-)
Thanks for the heads up about Solidify! Sounds great.
It has been a while since I last tinkered with Blender.
The thing about Thingiverse objects, including mine, is the sloppy 3d modeling. I got a bit careless to make an object a day, and my UP prints almost anything, even if the STL file has flaws.
But of course there's software to fix these models. I have to check the auto-manifold option in Blender... Usualy those functions have limits with sloppy models.