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https://creativecommons.org/2016/09/09/why-were-fighting-to-protect-noncommercial-uses/

If they give you the STL and you charge for the plastic and machine time, it does not violate the non-commercial portion of this creative common license, because they are going to keep it for personal use. If you offer to sell these or advertise them for sale, you are violating the non-commercial clause of this creative commons license.