Does anyone else have problems printing thick material on the vj1604? everything works fine when i print on materials that are 10 to 14 mil.,but once I jump to 17 to 18 mil, things go wrong. Problems range from pf errors, prints not aligning properly, head strikes, and so on. I tried unrolling the material to give it slack, clean the wheel connect to the pf motor, check the belt, lowered the vacuum, adjust the heat settings, and nothing works.