Below are some sources for 3D files. Some are ready to print, others will require tweaking.
With a 3D printer, you can actually form physical objects, even gears that can be assembled into a working model. A 3D printer usually prints with hot plastic, but there are some food printers out there in case you'd like some space shuttle shaped chicken nuggets. 3D printers can be expensive - $1,500 for a "home" model and up to tens of thousands of dollars. You'll also need a computer model to print some. Some are publicly available and some you or your patrons may need to create themselves. They can also take from hours to days to print. Despite these drawbacks, they are currently being used in places like the Fayetteville (NY) Free Library and some museums.
Here are some organizations in the state using 3D printing. If you know of an Alaskan organization with 3d printing capability, please let us know.
PO Box 110571
Juneau AK 99811-0571
395 Whittier Street
Juneau AK 99801