The products of a 3-D printed are physical parts. You would have Franklin's stellar contribution, the temporary exclusivity of manufacture, to not apply to anyone owning a 3-D printer.
Somehow, unlike owning a smithy, owning a 3-D printer exempts one from obeying the spirit of patent law.
As long as you don't offend my prophet, that's cool.
You, on the other hand, are full of yourself.