Useful resource, but some of the content isn't appropriate for classrooms
Community Review for MakerBot Thingiverse
My Take
Thingiverse is not moderated, so content might be iffy. However, it can be really useful, especially with older students. It would be great to have a Thingiverse created for K-12 environments. Caution: Many students would love to just find something on Thingiverse and print it rather than do the design work. Framed properly, it can be a really powerful design tool for students to understand the possibilities.
How I Use It
When 3d design is introduced, this can be a really helpful tool. It can also be helpful for students to do mash-up or remixed designs. It's also a good source for teacher-created manipulatives you can print if you have access to a 3d printer. A word of caution - there are many designs that wouldn't be appropriate in a classroom setting.