3D Systems (NYSE: DDD) is slated to report its third-quarter 2018 earnings after the market closes on Tuesday, Oct. 30.It's on track to be the first of the two big pure-play 3D printing companies to report, as Stratasys is scheduled to release its earnings on Nov. 1.While it's pulled back since notching a 52-week high in late August, 3D Systems stock is still up 92.3% in 2018 through Oct.