"Wubba Lubba Dub Dub!!!!!"

“I'm a scientist, because I invent, transform, create and destroy for a living. And when I don't like something about the world, I change it.”

Wishing you could have a portal gun that flashes or lights up? Here's a great model remixed with the gun body hollowed out to give you space to shove some wires and crap in it.

The portal fluid tube is also hollowed out so it may be easier to set up a transparent print. But you'll need good FDM settings or a resin printer to make it really semi-transparent.

The barrels are unmodified from OP.

If you need wiring advice, Button→battery→LEDS→Button. 

"Nobody exists on purpose, nobody belongs anywhere, everybody's gonna die." Print yourself a portal gun and make it light up.

I printed and hacked it up but this model makes it easier for you to do the same.