Creator Matthew Davis, a 3D printing artisan, released instructions on constructing a full-auto gatling gun called The Arcus, which is capable of firing 48 rubber bands in a matter of seconds.
Unlike most other rubber band gatling guns, The Arcus uses energy from the rubber bands that it shoots to spin the barrels, Davis says.
The Arcus features an arm mount system, meaning that to hold it you put your arm through the center and the barrels will spin around your arm. A cam system is used so that when you pull the trigger the barrels will start the rotation.
All of the parts are designed to snap together, no screws or glue will be required, because of this it can be taken apart and reassembled as many times as you want. The only other thing used in the assembly besides the printed parts is rubber bands.
All of the parts are designed to be printed without any supports and designed to work with #64 rubber bands with six rubber bands loaded onto each firing block.
For complete instructions, follow the link here.