If so, he pulls up the design someone ordered — his favorite is a rainbow plastic skull — and puts his 3D printer to work. Most prints take at least two hours to create, so the machine works while Heitmann heads to his fourth-grade classes, the 10-year-old from Indiana says. Many of his toys sell for less than $20 apiece. He works roughly three hours per day on his side hustle, he says. Equipped with his printer, Heitmann watched YouTube videos, took lessons on Outschool.com and asked his parents for a second device, a Bambu Lab P1S multi-color printer that currently retails for $949.

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Persons: Jacob Heitmann, —, Heitmann, Ender, Heitmann's, Chris Organizations: CNBC Locations: Indiana