Print a vacuum cleaner

from geek.com

Print a working vacuum. er... buy a small dc motor, download the files from thingiverse, use your reprap to print all the plastic bits, fiddle with it a lot,  and eventually get something resembling suction out of the end. No illusions here about this being ready for mainstream, but still freakin' AWESOME.

heh while watching the video, also found a 3d printed moustrap as one of the videos advertised at the end... also awesome.