No? I don’t want one, and that’s mainly because I don’t have the land to test it. Its something I want to do one day once I own significant acherage.
I have however, printed fully functional firearms (G19x, FGC-9, AR-15, others). An RPG is well within feasibility of modern desktop printers. Look on YouTube or FossCAD on Reddit if you don’t believe me. RPGs, Grenade Launchers, Silencers, full guns, and plenty other improvised weapons are fully printable with plenty of examples online. And perfectly legal for most US citizens to make.