My guess is that the teflon coupler is ever so slightly deformed inside in the lower end (happens when printing extensively at 230+C.)
The flexible material has even more problems passing this place.
How to try:
Heat hot end to 200. Wait 15-20 minutes for heat to move into Teflon so it deforms if it is weakened.
Dismount bowden tube.
Performing Atomic according to Epic support at www.3dverkstan.se (yes, it is in english), using any normal PLA.
Verify that the PLA moves freely.
Then, if the flexible material is really soft, you need a 10cm piece of bowden tube (which you have lying arounf, of course), and try to insert the flex material from there. If it stops it will be due to deformed Teflon coupler.
If it moves freely then we are speaking of extruder / tube problems
Load up with the flexibale stuff.
MOVE MATERIAL in advanced settings.
The Flex Material should push out of the bowden very hard indeed, so that you can almost not hold it by hans.
If not, Replace feed with iRoberti feeder, and /or lubricate filament ever slightly 1 drop oil every yard or so, they say.
Easier to try and see if the flex material does indeed move freely in tube. If it does, THEN its the feeder drive mechanism alignment/construction.
If all this is not possible for you, there is a 26,14 percent chance it can save the day by loosening the 4 vertical shot end assembly screws a little, possibly offloading the teflon a little. But it is a little like peeing in the pants to keep warm, if you ever tried that!
Maybe they succeeded themselves and could give you some hints?
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