I have a sawgrass SG500 and will be using a sheet per t shirt, but not sure how much to charge for the design. Htv I can work out but I don't know how much Ink the sawgrass uses. My bug printer gives an estimate of usage so I can work it out but I'm coming up blank for the Sawgrass. I know it depends on amount of detail etc , so say a big colourful design. Any advice would be welcome tia x