Filament twisting during prints
I had this problem with the MK4, although not so bad. However, first few test prints with the MK4s and I can already see I have teh issue again. Filament seems to twist as it goes in to the extruder.
This is a brand new build.
I have tried adjusting the screws in different ways - this does not help.
I have also recalibrated the gears.
Anything else I can try?
Thanks
RE: Filament twisting during prints
I originally had this with my MK4, and addressed it by printing and replacing the idler arm parts myself at .15 structural, which turned out much cleaner than the original MK4 factory parts. I also paid more attention to perfect alignment during assembly of those parts. Obviously in the case of the MK4S, reprinting isn’t an option for some of us due to the more special PA-CF. I can say, however, that the cleanliness of the new extruder parts that came with the upgrade is excellent, at least as good as the ones I’d previously re-printed in PETG.
Thinking about the roller pin alignment in the idler arm, it’s easy to see how the slightest shift in how the two plates are screwed together can have a bigger impact on roller symmetry than adjustments on the idler screws. I only just upgraded mine this last weekend, and haven’t done a long enough print to confirm that mine is perfect yet, but this is how I would approach fixing it. When the idler arm parts are held (but not yet screwed together) there is a tiny bit of sheer movement between them. I would play with that bit of variation, shift it and tighten it in different positions, starting with perfectly aligning the outside surfaces of the printed parts, but then try different positions if the problem persists. Those tiny shifts will be changing the filament roller alignment more significantly, and will hopefully fix your issue.
-J