A printing system includes a housing, a track supported by the housing, and a cart which rides along the track. The printing system also includes print heads which eject material onto the cart. To prevent material from inadvertently accumulating on the track and the housing, the cart also includes a wiper configured to wipe the material from at least a portion of the housing. The printing system also includes at least one collection tray configured to direct and/or collect the material wiped from the housing. The printing system further includes a coating applied to outer surfaces of at least some of the elements of the housing, the track, and the cart to further prevent the material from inadvertently accumulating on the track and the housing. The coating can be a siloxyfluorocarbon coating.