Creator and Hack A Day user Max K explains a little more about the Arduino-based 3D printed smartwatch. After assembling the third revision of the watch, I decided to test its battery life.

A DIYer has pieced together a railgun of 3D printed pieces and other parts. The 3D printed prototype made by the U.S Navy is considered legit.

Like the Arduino microcontrollers, the printer will be open-source. The machine features a print area of 140 x 100 x 100 mm, and a print volume of 1,400 cubic mm.