That looks similar to mine. Does this vary with speed settings? If you want to go to a printing speed 100mm per sec should we have deeper marks, or should it work as it is?
that's the same as mine now. I found no marks, or intermittent marks means under-extrusion. if you tighten the thumbwheel too far it will actually fracture bits of PLA and you'll see chunks missing as it moves up the bowden tube.
I've never personally found the 'oval deformation' problem that some have reported but would imagine it's deeper marks than those shown.
the pattern needs to be nice and regular like you show, it looks a bit like a shoelace, for want of a better comparison.
I also have indentations on the filament:
They look like this:
I use a filament "pusher" derived from the Geo Hagen's one.
It uses a knurled wheel from Fabberworld that works fine.
I never observed an ovalized filament, even by thightening it a lot.
when you get your ultimaker, is there a default position for these feeder wheels or is it just... go by feeling and tighten ?
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