Has anyone looked at DDD (3-D systems)?

I've converted 77% of my 401k over to an IRA, and bought some DDD. Have to keep a close watch on it, because don't want to get caught in any quick down drafts there. But this is a stock I call a parabolic. Straight up for the past 6 months. Looks like it still has some room to grow.

http://bigcharts.marketwatch.com/quickch...p;x=43&y=17