The most annoying thing is having the extruder head drag a lump of PLA across your work-piece and messing it up. I have cleaned the head thoroughly with very fine wire wool so that it has a polished appearance then put a very light smear of high temperature silicone grease over the whole surface to prevent the PLA sticking. This has proved very effective and it is rare to get that problem now but I do keep a look-out and clean and re-grease when necessary. Don’t get the grease on your platform as it is near impossible to remove, even with solvents!
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