This stock is too much of a good thing to sustain. This and SSYS are bubble stocks. Yeah DDD just split, but it still isnt worth the price. 3D printing is my favorite hobby and really the at home systems are starting to catch up. Yeah sure most at home ones arent as good as a comercial one, but with time patience and a lot of calibration you can get as big of build areas for 1/10th or better of the cost. These stocks are a Fad that is following an upcoming new technology, but long term continuous growth doesnt show up in the models.
Definitely ramped up on hype and now corrected a bit, but I think you're underestimating the long term prospects.
"Time and patience" is the key. Many, many, many potential users of this tech have neither. That's who DDD are targeting. Same goes for most companies to be honest. You can build a car at home if you have a bit of time and patience, and many people do, but that doesn't stop commercial car companies from being hugely successful.
It is obvious that 3d printing will change our consumer world. And in contrast to many internet companies (referring to the bubble talk) does a 3d printer company actually sell something. it can make profit easily.