Makerbot 2 Extruder

Hello from Germany, I have a Makerbot 2 Printer. He starts wonderful, but suddenly
he prints "into the air" - no filament visible. When I stop the print, I find out, that
the filament ist in the extruder building a little node around the little "gear" in the
extruder. I completely cleaned it several times, changed the nozzle, but...
See the picture. Perhaps someone has a an idea.
Thanks, regards, Erhard.

Are you trying to print with flexible filament?

Those plastic extruders aren't reliable at all, I will recommend you to get some aluminum ones.

if you are trying to print flexible filament you need an extruder that will support the filament after they pass the gear. For your printer the Flexion might be a good fit?

heat creep softening up higher up causing the filament too soften, is the fan working over the heatsink part?

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Thank you, yes the fan in front is working. The fan on the left starts delayed.
I try to change the extruder!?
Thanks, regard, niche Christmasdays, Happy New Year, Erhard

yes if it's a dual then the fan on the extruder that working should be on from start then the second kicks in I think when the 2nd thermistor goes up to a certain temp I am going off a clone too a MakerBot 2 replicator a wanhao duplicator 2, also what material you printing with and temperatures,maybe blocked hotend to if it has pfte liners id check them 1st see how bad they look if its been used they get a bit yuckky had to replace mine on my dup 4

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Check my rubbish blog for my prusa i3

up and running
[3dimetech.blogspot.co.uk]