This Ricoh head (MH5220 series) is compatible with UV-based inks. 

A 2.5 pl drop size allows for excellent print quality without graininess. With 1,280 nozzles configured in 4 x 150dpi rows, this head achieves high-resolution 600dpi printing. Additionally, the ink paths are isolated, enabling a single head to jet up to two ink colors. 

Product Specifications

• Dimensions: 89 x 24.7 x 64.2 mm (excluding cables)
• Head materials: SST, Nickel alloy, and Epoxy Adhesive
• Number of nozzles: 1,280 (4 x 320 channels), staggered
• Nozzle spacing: 0.1693 mm (1/150″)
• Max. number of color inks: 2 colors
• Temperature control: Integrated Heater and Thermistor
• Operator temperature range: 60° C
• Drop volume: Binary mode : 2.5pl / Grey-scale mode : 2.5-9pl (depending on the ink)
• Jetting frequency: 30kHz
• Viscosity range: 10-12 mPa.s
• Gray scale: 4 levels
• Number of ink ports: 2 x dual ports
• Alignment pin direction: front (standard)
• Ink Compatibility: UV Inks
• Weight: 148 g

Printer compatibility
Sign Racer Flatbed 1610

And all Chinese different brand UV printer which assembled with Ricoh Gen 6 printhead.