No need for a toy gun. “3D printed guns” are all actually 3D printed gun components, printed separately, and joined together separately, in almost all cases joined together with metal parts.

So it will stop you from printing a camera grip, as that’s the same as a gun grip. It will stop you from printing a flashlight body, as that’s the same shape as a silencer. It will stop you from printing a switch toggle, as that’s the same as a gun safety switch. Almost all “gun components” are parts with legitimate non-gun-related uses that cannot be distinguished until you see what they are actually used for. A “3D printed gun” is not a gun coming out of a printer, it’s lots of separate components coming out of a printer, in separate prints.

And of course the separate issue is that even if your prints are allowed, it means everything you manufacture is uploaded to an online service for judgement, where I’m sure it will be stored securely and not stolen/leaked.