I have a c120 and use www.injetcarts.us refillable cartridges. They have a set made specially for the c120, including the 2 black carts. My favorite opaque paper is the JetWear for darks, but I'll warn you I've not been very pleased with any of the opaque papers. I've had much better luck with Laser transfers, though it ain't gonna be like a dtg print or screen print. There's some heft to anything with a opaque polymer backing. I've had to accept it. Some customers (surprisingly younger ones) seem less put off by the heavy hand. Personally I don't like it and won't even wear shirts I make using the opaque papers. I'm currently testing Wow 7.1 with my laser in hopes (despite the additional cost) of finding an acceptable, if not optimal, solution. Best of luck.
A forum community dedicated to T-shirt merchants, professionals and enthusiasts. Come join the discussion about graphics, commerce, dyes, prints, collections, guides, displays, styles, scales, equipment, accessories, reviews, classifieds, and more!