It was not a OEM. It was from amazon it cost $500. Does Roland just sell the print head? When I reached out to them they said they would have a technician come out and look at it with all new replacement parts and quoted me at $3800. A new printer doesn't even cost that much.
Okay, yeah, you definitely got scammed on that printhead, there are no new print heads that cheap for these printers, probably looking around 2K for a genuine new one. You'll need to find either a local Roland dealer or I know there are a couple Roland dealers on here that might be able to assist. Although you might be able to buy a printer for cheap, the upkeep and maintenance is what costs you in the long run.
Based on what you've said, even though it's going to cost a bit, might be best to get a tech out there, that way you'll know it's done right and covered under a warranty, so if something goes wrong during the installation, they'll have to fix it for you. But if you're not interested in paying that cost, you may want to just buy a new one if you can get it for cheaper then the $3800. You might be able to get a better quote from another dealer.