+1 In the meantime, if anyone is interrested, for now I use the following script (in start script), it does not use M600 as it is not working on my printer... You just need to create a Process named "Process1-2" to pause and change your filament. {REPLACE "; process Process1-2" "M83\nG1 E-10\nG0 Y10...

+1

Thanks for your time !

I finally end to the conclusion that 3 perimeters are required when EW/LH ratio gets high, this is not a big constraint and give a lot better results.

I can finally print my cube !

Ok back after further tests, some observations : Problem appear with retractions, but blob are not where retractation take place, they are rather where retractation lands. Indeed my goal is not to print a simple cube, I could achieve a nearly perfect one by simply disable retractation, but rather pr...

Try to reduce fan, or even do a test with fan disabled.

I have tried differents settings and I am still unable to print a simple cube with more than 5% infill using 0.4 nozzle and 0.3 layers height. I wonder if it is possible, maybe the ratio of 75% pointed by Horst is the key and what I try is just not possible at least with a cheap printer ... Here is ...

I have also noticed that S3D infill add extra-perimeters in some case and even worst not for the whole perimeter... (because if so, we can just remove one perimeter and it will be ok).

You should try differents paterns for infill, triangular and grid do not seems to add those extra-perimeters.

Ok, what I can say to the problem is: the layer height 0.30 mm, related to the nozzle diameter and its extrusion width of 0.40 mm each, is a lot out of range! It makes 75% layer height / extrusion width while values of 30% and below are recommended. Thank you, that make sense, and it would explain ...

The blob in the preview are where retractations take place(you can uncheck an option to no display them in the preview), and retractation may produce blobs when printing.

I really think that this problem may come from the path of the nozzle when using infill. I will investigate more on the generated gcode to see if I am right or wrong. Maybe I missed an option in the slicer but I have done so many tests. For now here are some results : Those tests have been performed...