well, the good news is that things seem to be working for now.
I'm not exactly sure what the exact thing that fixed the problem...
I did tighten the nozzle / brass pipe.
I also installed a replacement fan for the nozzle. The prior one had broken and I had been running fanless for quite a while - I think this was main problem...
Been running all weekend without a single jam. On the same blue filament that was giving me troubles. And a new spool of red which is working fine too.
I probably will install a hot-end fan above the aluminum block as others have recommended.
But happy to be printing again!
Many thanks for all the advice and help.
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derek-bosch 1
the advice to have the brass tube tight, and the nozzle a little lower seems opposite from the assembly instruction manual, but I will try it.
I will also try a fresh spool of filament to see if my woes go away... hate to waste 25% of the spool though - time to invest in some larger nozzles
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