Hovercraft
thingiverse
Check out this link - http://www.thingiverse.com/thing:1328403 - if you're interested in building an indoor hovercraft from a foam block, and want to discuss other parts of the project. Otherwise, feel free to ignore it.
Download Model from thingiverse
With this file you will be able to print Hovercraft with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Hovercraft.