Designer J.C. Karich shows how you can make a pair of working headphones with nothing but raw materials and a 3D printer with open source designs. Karich made his 3D printed headphones and created the speakers by coiling copper wire around a groove built into the printed casing and had a spot on the opposite to house a magnet.

The jack is also 3D printed, and he wired up a fabric connector from fabrick.it for the headphones' cord.

Check it out below. And if you have access to a 3D printer with some raw materials,l you can get the designs here: [j.c. karich via Thingiverse via Yanko Design]