Stratasys (NASDAQ:SSYS) Just missing the classification of stocks under $20 by a few bucks, Stratasys is the vanguard among the best 3D printing stocks. Scott Crump, a Stratasys co-founder, patented the fused deposition modeling (FDM) technique of AM, later issuing the patent to the company he helped create. Subsequently, Stratasys developed several 3D printers for both professionals and private consumers in the 1990s. It remains a powerhouse, developing products and services for several industries such as education, dental, aerospace and automotive. Open 8.540 Close 8.620 Vol / Avg. 470.871K / 827.704K Mkt Cap 734.355M Day Range 8.370 - 8.630 52 Wk Range 7.340 - 12.810 3D Systems (NYSE:DDD) One of the most recognizable names among 3D printing stocks, in early 2010, DDD was among the compelling stocks under $5 . Later that year, the equity unit more than doubled in market value.…