i have an xc-540 that we've had 14 or 15 yrs and i use 3rd party inks in that. they are a nazdar brand. nazdar makes ink, that's what they do so i trust them. (we have been buying silk screen ink from them for over 30 yrs that i know of.) we also have an xc-640, lej 640 and the truvis all of which we use the oem inks. have you shopped around the oem inks and or asked the sales rep for a better deal? with that said how much work are you losing because of the price of the ink? especially in the truvis. we print a lot of stuff, mostly short run items but we get some long run jobs here and there and i don't buy a ton of ink. also i am figuring the ink cost in the job so it's covered. i am pretty sure i am not losing jobs because of what i figure for ink cost. also like someone mentioned you will void your warranty so i would at least wait till that's up before putting 3rd party ink in it