3D printing

We've got a new 3D printer in the design technology department at school. I've been exploring some options for what to print. I asked around for people who might have some ideas for files to print, and there were some lovely ideas.
Thingiverse is an online warehouse of files which allow you to print out objects.
I'm going to have some of these printed out in the New Year. They are printed at 1: 50 000 scale and so sit on their own footprint on the OS map of the same scale... Cool...
Thanks to the Field Studies Council for sending details of these files.

Does anyone else have ideas for 'geographical' things to print out... I'm also thinking perhaps of jigsaws of country (or county) outlines for the UK perhaps...