of course tried different filaments ( Jayo PLA black, eSun Pla+ black/grey, Amazon Basics PLA black)
Its only when I print larger objects with a flat surface, smaller objects are printing fine. However I cannot explain it to myself, I would be glad if someone had a solution for this, because I don’t know what to do anymore.
How many top layers have you set and which infill density?
Especially in the last picture it looks like the top layers are still sagging between the infill.
Looks like under extrusion. The gaps between lines disappear near the edges where the nozzle is moving slower, then widen as it reaches full speed on the the longer straight sections.
I would fully recalibrate the filament using OrcaSlicer (top line calibrations), with the nozzle/hotend you plan to use. Temperature tower, flow rate, pressure advance, and maximum flow rate.
Change the infill to something other than grid (gyroid works pretty well), or at a least use more top layers so the infill does not show through.
Alright I will try that and will tell the results, i have just installed the slicer and started with the temp tower.
Is it best to run the tests from top to bottom or is there a more effective order?
I have always run top to bottom. I’m sure there is some interaction between the settings, but I get good results, and have not tried a different order. I suppose some slight changes could be indicated by re-running the tests, or using a different order, but I’ve not taken the time to experiment. I’ve also asked the question of test order on the OrcaSlicer Github, but never found a definite answer.
I fully recalibrated the printer with orca and now most of the underextrusion problems are gone. The calibration wasn’t quite easy, I highly recommend to do the maximum volumetric speed test first. I did it at the end and changed the volumetric speed from 12 mm³/s to 28 mm³/s ( I am using a highflow hotend) and after changing it, my printed parts had massive over extrusion. So I needed to do the whole flowrate calibration again but now it works properly.
