The people at West Fork Armory, used their Class 2 SOT license, to legally make a suppressor using a 3D printer. It took 3 hours and 20 minutes to print this out.
According to Fishgame.com:
The idea behind it is to have a .22 suppressor that does not require cleaning. Instead you just send it in every couple thousand rounds for a replacement baffle stack inside an aluminum tube.