After printing several fine structured, low height (0,6 - 1mm) texts with no problems, I'm now (after 97 printing hours with 53m printed) running into problems. I attached a (multi-picture-)picture where you can see printed text.
Pics 1 and 2 show the current prints which mostly are ripped of by the print-head either because the Material doesn't stick properly on the bead and is ripped of already when printing the first layer, or because of parts that bend up after the printer has printed a few layers. Pic 3 shows a text that I printed before (along with many others) without any issues. It happened also before that something has been ripped of, but rarely and now it is always ripped of. When I'm using 1mm Brim it prints o.k., but Brim is not acceptable for decorative text. As I'm not printing decorative stuff very often (only sometimes for a colleague), but mostly functional parts (which still print without any/relevant issues) I'm not extremely worried by now, but maybe the problem increases and I would like to find out the reason. I already recalibrated the build plate (several times with different distances), cleaned it accurately and did the "Atomic - Method". Also the marks on the filament behind the feeder do not reveal feeding issues (as far as I can say). I also tried it with a different Material (but from the same supplier: "Innofill") with the same result. At the beginning of the print when the Material is printed in the air, the flow is straight and looks good.
Despite that I still have the feeling that there is a little underextrusion during the print! Could it be the coupler or more likely the nozzle (or something else)?
I'm using a 0,4 nozzle with a "Layer Height" of 0,06 and a "Wall thickness" of 0.4. "Print Speed" and "Infill Speed" is set to 30, "Travel Speed" is set to 120 and "Initial layer speed" is set to 20. "Retraction" is enabled. Most or even all (I don't remember exactly) of the properly printed text was printed with Cura V2.2.x, but now I'm using Cura2.3.1.
Thanks for the help in advance!