Patent ID: 9469076
Filing Date: 2016-10-18
CPC Classification: B08B,B29C,B33Y

Claim Text:
1. A printing system for forming three-dimensional objects comprising: two laterally spaced rails, each of the rails having an internal cavity extending through the rail along a longitudinal axis; two heating devices, one heating device connected to the internal cavity of one of the two laterally spaced rails and the other heating device connected to the internal cavity of the other of the two laterally spaced rails to enable each heating device to heat a surface of the rail to which the heating device is connected; a platform configured to move along the two laterally spaced rails; and a pair of scrapers mounted to the platform, one scraper being positioned to engage one of the two laterally spaced rails and the other scraper being positioned to engage the other of the two laterally spaced rails to enable the two scrapers to remove contaminant from the heated surfaces of the laterally spaced rails as the platform moves along the two laterally spaced rails.