Pictured above is Thingiverse member SexyCyborg, who previously showed us her 3d printed hidden hacking kit. She's back with a wrist-mounted launcher that she designed and built herself for her Cheerson CX-10D nanocopter drones. You can see a complete gallery of her photos here, as well as the downloadable 3d printing files here.
On reddit, she explains that she designed the components in Tinkercad (which I can personally recommend as a starting point for designing objects for 3d printing). Magnets anchor the drones into the launcher. Her belt buckle holds the controller for the drones.