Ricoh GEN4 (MH2420) Printhead This Ricoh GEN4 (MH2420), 384 channels, 30 kHz, 7 picoliter, greyscale printhead is suitable for Mimaki UJF-3042 printers. This printhead has an integrated heater and thermistor. This is the Ricoh original printhead, covered by a manufacturer warranty. ..