Can't get ABS to print on Solidoodle

[Mcbride19]

Well to give you a simple explanation when you are putting too much heat on a metal it becomes recooked as we say in France so the metal becomes less hard and holes are changing diameters by this way.
So imagine that if you are using a 0,35 mm hose it can became a 0,37 mm or even a 0,41/0,42 mm hose, it's a real big difference for the flow of the plastics.
Just do this simple experience : take a knife and use a bunsen on the blade until it became red, after that the blade won't be hard anymore.
it's the same for all metals but with different temperatures and also with brass that the nozzles are made with .

If you want to clean without any problems , just use acetone , it will take 2 or 3 days to melt all the ABS inside the nozzle but it will be safe for the nozzle. So the best think to do is to have a few heads or nozzles !!!