We lost the ability to print $50 bills with our HPs[2] and it had no noticeable negative impact on society. I'm not sure why losing the ability to print a gun with our Prusas will be any different.
[1] - https://www.scienceabc.com/eyeopeners/cant-photocopy-scan-cu...
[2] - https://h30434.www3.hp.com/t5/Printers-Archive-Read-Only/Won...
There are plenty of people who change their behavior because that tracking is in place, regardless of if what they are doing (or would be doing) is in any way illegal.
Terrible example IMO.
Maybe the way this applies to everything should be an indication that it's unrelated to the point I made about blocking the printing of certain things.