thanks for your response.
The difference in friction when moving the pla down the bowden tube by hand was noticable - so I think the new tube probably did help a bit.
My printing temperature starts at 230 then drops to about 190, and in the past (when things were working well) these temperatures were fine.
I also try to avoid leaving the printer hot and idle, as I read somewhere this was bad for the printer.
If you let me know what further information would help with the diagnosis, I will dig it out.
difficult to diagnose anything from this info.
generally, if the tube wasn't a bad one with bad ID, there was no need to replace it.
print failure after a couple of layers happens when you let the printer get too hot while letting it sit with heater on without printing, or by printing at a way too high temperature, causing the upper part of the brass tube getting too hot, and causing a plug of sorts.
lower the temp in 5 deg steps until the extrusion starts to look matte, not shiny any more. then increase your temp by 5 deg again, since that will be a nice print temp for low/med speed printing. and don't let the printer idle while hot for more than 1-2 min.
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