Advice on Possible Nozzle Clog

Could be a partial clog, but I'm also wondering about extruder temp.  Any chance the thermistor position changed?  Perhaps resulting in hotter prints?

I definitely suspected both of these as the culprit.  After installing a new extruder body, I can see how the thermistor changing position could be a problem.  I managed to overtighten and break my wooden piece on the old extruder, so I don't think it's too crazy to think that I messed up the placement.

The only other thing that says clog to me is the fact that my hotend can no longer operate at the low temperatures that it used to be able to handle (200°C).  If I just warm the bed up and hit the start button, the extruder will not warm up enough (even at the default 200°C) and will jam until it has had adequate time to warm up.  I've been bypassing this by preheating the hotend to around 205°C for a minute or so, and then running at around 205-210°C.  Running at 200°C is possible once the hotend has had time to heat up for a while, but it sounds like it causes unnecessary strain on the motor.  This could all be a byproduct of bad thermistor placement, but it also hints at a partial clog.

I will try to look at the placement this afternoon to check, and I will also try to run a single wall calibration print at my typical settings to see if it is still in spec.  I have previously calibrated the sizes and multipliers for each of my filaments, but it might have changed since I've gotten further into each roll.  The only reason I suspect this less is because I have attempted this with different colors and had similar results across the board.

TickTock,

It was a pretty severe clog.  Burnt plastic had made its way out of the nozzle through the threaded areas.  My extruder was pretty much junk, so I got an E3D v5.  You could try using acetone on your brass nozzle to break up any clogs.  Just soak the nozzle in some acetone for a while, and then use a small needle/paperclip to get the gunk out of it.

I've attached a picture of what the clog looked like on mine.  It was pretty far gone at that point.

Sounds like everyone in this thread needs to get an e3d. What's a clog?

Boz, that is CRAZY. I cannot believe how much plasfic that is. Good lord.

Edit: why was such an old thread revived? Weird

I found the old thread because I was searching using Google image search to find someone with similar symptoms.  After cleaning out the nozzle everything seems to be back to normal.  Until this happened, my SD4 had been working phenomenally.  No well nut; no E3D.  What is it about the E3D that would make it less susceptible to clogs?  All I can think of is the enclosed filament delivery system (very hard for foreign material to fall inside).