From some time I have a lot of underextrusion problems with my A10T. Only the 3rd extruder works fine, with the 1st and 2nd most times I have underextusion, but not always! I was trying a lot of things - cleaning nozzle, steps, cleaning filament even with cotton piece in front of the extruder (I saw some tiny dust in the extruder metal weel).
This was until I recalled that once, when I was changing the filament, I felt some tiny ticking/cracking when releasing the extruder lever with the new filament. So I took a close look at the extuder and found out that the levers of the 2 extruders have a crack! Only the 3rd is ok. I was going to look for metal replacement, when I saw my 3rd exturder level is a bit different - and yeah, the model is more solid obviously works and lives better that the other.
So check the pics I have uploaded - the red are the broken one, the green is the solid and working one. Mind the arrow and text in pics.
The weak one has a gap behind the wheel, where the solid does not and so have much more material to stand the pressure of the spring and does not cracks, works perfect!
I started looking for Geeeetech extruder & parts and was suprised that on ebay all pics are of the weaker type!
This is so disappointing...
I`m going to put something on the this gap for now, maybe will look for a STL to print out. Will see.
