All sales of Melco G2 and G3 Direct-to-Garment (DTG) Printers ended in 2014. Melco no longer provides support, service or parts for those printer models.
After-market parts may be available from Compass Micro or Garment Printer Ink: https://melco.zendesk.com/hc/en-us/articles/360032831671-3RD-PARTY-PARTS-FOR-MELCO-G3-DTG-PRINTER
Documentation Resources are available here: https://melco.zendesk.com/hc/en-us/sections/200583379-Melco-G3-and-G2-DTG-Printer-Support