3D printed Dart Launcher that used motors and flywheels to launch darts up to 70 feet, All 3d parts can be printed without any support material. Takes about 15 hours or so to print all the parts. All parts lock together via little tabs and then zip ties are used to clench the pieces up nice and tight.
https://youtu.be/lkN32zHImtA
https://vimeo.com/188393344
Technical
PLA Filament printed at .3
2 motors (edited 11-03-2016 had the wrong motor listed.. sorry about that.. the one I listed will still work it just won't last long.. use the one below)
https://www.pololu.com/product/611
8 zip ties
1 rubber band
4AA Batteries
1 plastic AA battery holder
https://www.pololu.com/product/1154