If you're looking for an interesting, low cost 3D printed project to build then check out my Radio Controlled Land Yacht project. All the .STL files are here together with a full parts list including screws and electronics. Happy 3D printing and happy sailing!
For more information please visit: http://3DPrintHQ.com/rc-land-yacht
This is an easy to print, low cost project RC project. You'll just need some radio controlled gear, 8 x 8 mm wooden dowel, a few bearings and some screws.
The full parts list is included and all the parts are cheap and easy to source. It's not too complex so you can build it from the pictures.
Rafts are not required but supports are required sometimes. See parts list for details.