Quote Originally Posted by awerby View Post
47 C is not nearly hot enough - PLA needs at least 200C and other materials need more. Check the temperature with another kind of thermometer to see if your thermocouple is off, but if it's not, then you might need to replace the hot end(s).
Sorry that I haven't replied, it's been a busy couple of days. Yes, that's the problem. It says it's at 47 C but it's much hotter. What I don't get is why it will read up to 47 C when the other head is heated but doesn't detect any difference when it itself is heated.