Abstract: A 3D printing apparatus to dehumidify and recycle a gas from a 3D printer is disclosed herein. The apparatus comprises: a gas inlet to receive a gas flow from a 3D printer, the gas flow comprising gas with evaporated solvents to be cleaned; a heat exchanger to dehumidify the gas flow from the evaporated solvents, the heat exchanger to cool the gas flow by heat transfer to a cold liquid stream from a chiller to saturate and condensate the solvents from the gas flow; a gas outlet to output the dehumidified gas flow back to the 3D printer; and a controller. The controller is to receive a humidity and temperature measurements from a sensor located downstream from the heat exchanger; compare the humidity and temperature measurements with a target humidity and a target temperature respectively; and control a chiller valve from the chiller based on the comparison to adjust the temperature of the gas flow to set an absolute humidity of the gas flow to a predeterminable value.

Abstract: A printhead servicing system comprises a humidified air stream generator (10) to generate a humidified air stream; a humidified air stream channeling module (20) to channel the generated humidified air stream to a humidified air stream ejection module (30) to eject the humidified air stream towards a printhead nozzle plate (52a) of a printer (50); and a wiping module (40) to wipe a printhead nozzle plate (52a) of the printer.

Abstract: A printhead servicing system comprises a humidified air stream generator (10) to generate a humidified air stream; a humidified air stream channelling module (20) to channel the generated humidified air stream to a humidified air stream ejection module (30) to eject the humidified air stream towards a printhead nozzle plate (52a) of a printer (50); and a wiping module (40) to wipe a printhead nozzle plate (52a) of the printer.