3D Systems (DDD) -2% and ExOne (XONE) -1.5%, following markets lower, after Stratasys (SSYS) announces it's buying desktop 3D printer vendor MakerBot, which competes against 3D's Cube line. Sources tell Kara Swisher MakerBot is on track to post 2013 revenue of $75M+, up ~5x from 2012's $15.7M (Q1 sales were $11.5M). VentureBeat points out Stratasys' cheapest 3D printer (the Mojo) currently goes for ~$10K, whereas MakerBot's Replicator 2 goes for $2.2K. 3D Systems has hinted Cube pricing could eventually go well below $1K. SSYS +1.7%.