On the surface, ExOne (NASDAQ:XONE) and voxeljet (NYSE:VJET) are very similar 3-D printing companies. Both compete in the industrial segment, use a similar 3-D printing technology, and boast some of the largest print beds in the world.

Where these two companies differ boils down to the materials they can print with. Voxeljet only offers 3-D printing in two different types of plastic and one type of sand. ExOne, on the other hand, offers 3-D printing in two different types of sand, five types of metals with seven different finishes, and a soda lime glass that's available in three different finishes.

This greater range of materials gives ExOne a competitive advantage over voxeljet, Motley Fool contributor Steve Heller argues. With more materials, ExOne can serve a greater base of customers and has a larger business opportunity than voxeljet. Check out the video below to get the full story.

Fool contributor Steve Heller owns shares of ExOne. The Motley Fool recommends and owns shares of ExOne. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.