I tried with a couple of different foil and always happens the same, when the heating intensity of the spots disappear, but then I have a problem that the foil raises and attaches it destroys the print head. Now we have emerged as a problem with white and black lines, which typically occur at the moment after the first 10-15 cm prints, and also disappeared on the last attempt. Nozzle is the opportunity to print OK, but it missed a little more after printing. Manifold on the heads are almost new. Sorry for repeated inquiries, I have a feeling that constantly occurs with some problems, and thanks in advance.