Resident 3-D printing analyst Steve Heller recently turned to Twitter to see what questions investors had about 3-D printing stocks. Twitter user "Another BS Podcast" took Steve up on this open invitation and was wondering whether or not 3-D printing player ExOne (NASDAQ:XONE) "was worth investing in."

In the following video segment, 3-D printing analyst Steve Heller sat down with the head of Motley Fool's industrials sector, Blake Bos, to discuss whether ExOne is a worthwhile investment for your portfolio. Blake and Steve also discuss some of the risks that investors should be made aware of before buying ExOne. (The relevant segment can be found between 4:09 and 6:49.)