My thermistor insulation looks a lot like this one and I'm wondering if that is contributing to my jamming issues? I was able to print a few parts yesterday over 2 hours each with no problem *with* the blackened insulation as a pre-existing condition - so I'm thinking not, but want to double check. I'm trying to rule out possibilities. Thanks, Jeff
Hi Jeff, That certainly is interesting - the blackened appearance would indicate that you hotend has been on a temperature excursion to some really quite high temps. Especially seeing how far up the insulation and quite how black it is too. I've seen a few hotends that have come back which have a heavily charred residue clinging to the walls which seems to the cause of issues. Here's an image taken with a microscope of a heatbreak with just such a charred residue on the inside of the heatbreak after I've milled the heatbreak in half: http://imgur.com/mnB1Fit The residue is tough, well adhered and rough. It is also not soluble in acetone. It would appear to be carbonised residue from very overheated polymer. Not something I have a solution for clearing out yet.
Additionally - you nozzle looks to be tightened up hard against the block, not with the gap between the hexagonal flat and the block as per the instructions which can cause a few issues.
