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California just passed a law forcing mandatory DRM in 3D printers
(www.theregister.com)
This is a most excellent place for technology news and articles.
Not the grip, the receiver. Serializing the grip wouldn't make any sense. Sometimes the receiver includes the grip, sometimes it doesn't, it depends on the firearm.
Either way, it's basically the "frame" or "chassis" of the firearm. It doesn't make sense to serialize any other portion because you could just swap that part out and have an ostensibly different firearm.
Grip/frame/chassis is the easiest part to make at home...
Yes, some part needs serialized no that does not mean we make it the easiest part to make yourself