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What would be a good tag to use for doing business/making profit with a 3D printer?
I'd suggest two different tags:
[monetization]: For selling, or profiting from printing, or from printing machines
[financing] (or [costs]): For calculating the cost of materials and machines, including operational expenses.
I would propose something as [business] or [commercial-use] as opposed to [personal-use] to differentiate between these posibilites.