So you have always wanted to own Tracer’s Pulse Pistols from Overwatch? As fntsmn has shared on Instructables, you can now 3D print and build your own Tracer guns. The developer used Adafruit components and LEDs that can be controlled from an iPhone. The model was done with Rhino 3D.
The above GIF gives you a better idea how these pistols look. More information is available here.