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I use blue painters tape. You want the type that has almost a waxy look to it. I also don't cool until the 5th layer and add a 5mm brimm if I do get curling. My nozzle is basically touching the tap as it drags across it, so I get high pressure on the first layer. I don't do anything more than 100% extrusion. I usually have to pry my prints off now. Jon's heated bed sounds better, but I'm not going to do that mod until later.