Oddly you can use Acetone to remove printer filament from metal parts, like the nozzle and heat block. Do not get it on any non-metal parts. Acetone does not really dissolve filament, but rather pulls all the oil like components of the filament out of it. So if you soak your nozzle over night in Acetone all that is left is a powder like material that can just be brushed off. I did this on my nozzle and heat block and was amazed. Anything in holes or threads can be easily brushed off with an old tooth brush.
1 Like