Apparatuses and methods that utilize material-handling systems in which material in the systems has enhanced stability, e.g., during conveyance of the material from a reservoir to a printhead through a conduit, the conduit having a conduit wall defining an inner conduit space and including a material line for carrying the printing material in the inner conduit space, wherein the inner conduit space is configured to carry a heated liquid, being heated from a liquid heater, to contact the material line.