I've seen some of these 3D printed guns on You tube. Many explode or Crack badly after one shot. It reminds me of the zip-gun days. I understand the tech is new, and will get better with time. I have to say I'm in favor of this bill, there will come a time when anyone could run off an entire series of firearms with no oversight at all. My biggest concern would be if they injure the user, there is no recourse.
No one ever said freedom was risk free. A free man assumes responsibility for his own actions.