Your argument only holds water as the Law specifically states any attempt to reproduce US Currency is a Felony. This is a Specific not a broad reaching law and only covers Federally regulated currency.
Sorry, but 3D printer manufacturing would have already been banned if everything was inclusive.
I'll do you one better, then. Lets say you take an item that is patented (keeping in mind I realize that most PV products are not) and make a 95-100% copy of it. You have not broke the law. On the other hand, the second you attempt to sell it, you are profiting on someone else's intellectual property, and they are owed money. Doesn't matter if you call it a clone or not, the law makes the determination based on % of similarity to the original product as described in the patent / TM, etc. If this were not the case, then we would have cloning of everything in the US. You are fully within your legal rights to make a 100% copy of a patented item, provided it is for your personal use. So you could 3D print a replacement part for your laser printer and use it and be within the law. You cannot, however, make a 100% copy out of 3D printed parts and electronics of a laser printer and sell it.
This is all a moot point, since all of about 10 products are probably patented in our arena. If they were, then the clones that are 95+% would be declared counterfeits (assuming the OEM filed suit) and not allowed past customs in most cases. They would certainly not be allowed to be sold by US retailers. I'll admit to a non-applicable example earlier, but this is a bit more on point (and just as pointless). A copy is still a counterfeit if it is identical or nearly so, according to intellectual property law.
I will not debate this further publically in an effort to not further hijack what is a good thread. PM is a thing.