I printed the final parts for my RepRap'd Milestag gun today. It's a muzzle flash suppressor modelled on this sort of design.
Here is my suppressor design after painting matt black:
The Milestag circuit drives a high intensity LED for the muzzle flash, but this sort of design needs to diffuse the light from the LED along the suppressor.
I've used PLA successfully in the past for this purpose, but I'm unable to print PLA at this time so Nophead kindly agreed to print me my design:
I've also managed to find time to fully assemble the gun:
Here is a video of the flash suppressor