So I swapped the worn stock arm on my extruder with another of the same design (which fixed the looseness of the non-driven gear), but that did not fix the underextrusion. I also replaced the bowden tube and coupler which helped a bit. Although I swapped the nozzle twice previously, the last couple were cheap MK8 brass nozzles which were from the same batch. So now I have swapped the nozzle with this one from Amazon, and from the looks of it the problem is almost resolved. The PrimaCreator nozzle is not the cheapest at about $6, but also not the most expensive. It's also not plated, just good old brass, but it looks really well made. I did not see any burrs, and it appears almost polished on the inside. I did not get pics unfortunately before I installed it, but the hole in the nozzle looked as good as any of the more expensive ones - though I only have a magnifier and not a real microscope to check it.
The test cube I printed with it is a definite improvement over the last one, and is acceptable now. Still, the first print with it was not perfect (had some boogers which I typically do not see with the same settings) - but I am still testing it. I have some longer prints lined up which should be a better test for the nozzle.
The test cube I printed with it is a definite improvement over the last one, and is acceptable now. Still, the first print with it was not perfect (had some boogers which I typically do not see with the same settings) - but I am still testing it. I have some longer prints lined up which should be a better test for the nozzle.
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