After searching for stuff to print with a 3d printer (belongs to my bro) I found some interesting entries on instructables.
Some guys built a prob bomb for airsoft with an arduino and a keypad. 108 more words
I’ve tried working with the Raspberry Pi, it shows the possibilities, albeit a small size this computer can get so much done. Tried hooking up the rPi with the UNO board through the Serial interface. 88 more words