Follow Up On 3D Printing Technologies

Follow up on 3D printer technologies as well as the respective companies who produces them.

http://blogs.barrons.com/techtraderdaily/2013/12/23/stratasys-rising-gabelli-ups-to-buy-on-higher-multiple-on-nylon-high-margin-materials/?mod=BOL_da_rta

Some of these counters are changed from BUY from HOLD and that makes me wonder if all this bubble is going to explode in the near future. Indeed all these companies are trading at a relatively expensive price according to P/E ratio. Stratasys (SSYS) has high P/E ratio assuming it means anything of 222 and 3D Systems (DDD) has a P/E of 63. Truly it builds up my confidence into believing what Jim Cramer said earlier on all these being a bubble due to overly price stocks.