Finally got around to opening up the waste cartridge. There really isn't anything to pour out. All of the waste ink is absorbed into the pads that welder.man mentioned. I don't have a press to squeeze all the ink out. I tried putting each layer of pad into a ziplock bag, and step on it, but that pretty much failed. Are the pads sold separately? The cartridge itself is in great condition, it would be nice if Roland sold replacement pads.