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Emerson I have both the big can and the micro liner, and while I do like both machines and think they are high quality...the rubber band systems on both machines suck. You can follow the instructions given all you want, but the rubber band is going to slip and slide throughout tattooing. I really do like these machines though. The big can is great if you use cartridges and puts ink in smoother than any cartridges built machine I’ve used.
Have you tried using it with the recommended fat rubber bands?