Hi,
As a search engine, i discovered a new one that's really fast and has a lot of models. I've been checking it out for a while and works like a charm! It has a great variety of respositories and saw that has more than 2 millions 3d models indexed.
The only thing is that it has not a 3d viewer like the one you mention, but sincerilly, a search engine is for searching 3d models you need. In case you need a 3d viewer, you can look at it in the respective repository where it can be downloaded.
Here I leave the link for you to check it out: STLFinder
