Not the first color printer. I'm not sure how long color sandstone printing has been available commercially, but it's at least since 2012 (see item #7 here):

Not the first color printer. I'm not sure how long color sandstone printing has been available commercially, but it's at least since 2012 (see item #7 here): http://3dprinting.com/materials/10-game-changing-3d-printing-materials/ http://3dprinting.com/materials/10-game-changing-3d-printing... and it's currently offered by Shapeways commercially. This may be the first color printer in a particular material,