Yea, you can literally buy a piece of plastic that just requires a Dremel to roughly hollow out, and from there build a complete AR-15 in less than an hour. No serial number, little to no knowhow, just a hammer, pin punches, a Dremel, and about $600.
3D printed guns are nothing more than moral panic bullshit. But so is gun-grabbing. Statistically speaking, there are few rational reasons to ban firearms, but this discussion is popular amongst people who have gun phobias.
You are 50x more likely to be sent to the hospital due to a dog attack than to be killed by a firearm. I know those two things are in no way equivalent, but I have never heard someone suggest banning dogs, despite the greater frequency of harm.
The reason why the largest demographic (by a large margin) for the victims of the 11,000 or so gun deaths unrelated to suicide each year are young black men, and the highest proportion of those deaths (also by a large margin) are from handguns, is largely due to the reason why that same demographic is the highest (by a large margin) in prison. The drug economy.
But no, let's discuss banning "scary" looking guns like AKs and ARs, despite these being the most popular rifles in the U.S. while simultaneously their use in homicide and crime is almost unheard of (except for the black swan mass (10-30) shootings that happen with them once every decade or so).