If you're considering a 3D printer for your library, take a look at this option — Printeer is a 3D printer created specifically for kids, and it only needs an iPad and wifi to design and print. 

The Printeer team says the design software...

• runs on iPad, a platform most kids are more comfortable with than a PC.  
• can be learned in about 30 seconds.
• doesn't require any intermediate steps between design and 3D printing.

No PC, no complex software, no fancy configuration settings.
Just touch the "print" button and watch it go.

You can get the full tech specs and order one at the Printeer Kickstarter page by backing the project with your pledge

Sources:
• Printeer website
• Printeer - A 3D Printer for Kids & Schools
• Printeer Updates
• Hat tip to Boing Boing