that was probably a cool zone blockage.
switch off .....
if you can't get the bowden out (sometimes it needs a bit of encouragement while you are pressing down with needle nozed pliers) then don't be afraid of taking the whole hot end apart so that you can then (switch on) warm up the heater and (switch off) push from below to release the blockage - only to about 140 and then I use a piece of cut coat hanger (gentle not to scratch anything) - that should set you back right.
30 minutes max
Remove the nozzle from the alu block. Reverse out the filament. Cut a clean end to the filament on an angle and feed it back in without the nozzle in place and with the head cool. Ensure that the filament feeds easily without the nozzle. It should come all the way out.
If it does, there is no reason why it shouldn't extrude assuming your temp sensor is reading accurately If it doesn't then something above the alu block is messed up. This could be the PEEK insulator or the Teflon coupler or even possibly the tube is crammed too hard into the telflon coupler that the end of the tube is pinched.
You can see the parts here on page 46:
One way to get the bowden tube out is to remove the nuts holding the fan on then loosen the four large screws about 3/16th of an inch pulling the alu plate down. This reduces the preload on the tube. Remove the clip and push down on the retainer. While keeping pressure on the retainer, pull the tube out. Reversing this process, preloads the bowden tube so that it is pushing back on the retainer looking it in place.. See the instructions above.
BTW the melted filament in the nozzle is normal.
The one with the burnt filament might be saved by super heating it over a gas burner or blowtorch. Be careful with a torch, I've only down this with a gas stove and I don't think it can get brass hot enough to melt. The filament, particularly if it is PLA will burn out. The nozzle will become black but keep heating it and all the crap will burn off and you will end up with a dull brass finish
When held up to a bright light, you should be able to see through the .4mm hole.
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