Handgun ammunition in Europe is as highly regulated, if not more so, than firearms.
A 3D printed firearm is useless without ammunition.
See what happeneds when they take your guns
During the Klintoon administration, there was a proposal to make all ammunition out of bismuth. No big deal until you realize that the majority of its mined in China.
The video said he printed his own ammo and showed his reloading equipment. I don’t know where he gets the powder. When growing up, my brother and I made black powder from the recipe in the Encyclopædia Britannica (Ed. 11) and shot a pepper-box we found in the attic. We made our percussion caps from tips of strike-anywhere matches and tinfoil.