Zackorion15

It is on my Anet A8. Yeah, I'v tested a lot on print speed too, and for all other cases i'v found the speeds i use are just fine. 20mm/s for initial layer 30mm/s for top skin layer 45mm/s for walls 60mm/s for support/infill All with 1000mm/s^2 acceleration Small perimeter features printed at 50% of standard speeds. I'm definitely not running the fastest here, nor the slowest. My testing found that the issue was less pronounced but still present with speeds cut in half. So, that tells me that the core issue is not caused by speed, just exaggerated by it.

Temp changed nothing on this particular issue. Motor is fine, has no issues in all other cases, simply this edge case issue. Bed level is good. Slicer settings is more likely part of it, but that's the rub, i'm not sure exactly what the slicer is doing that might result in the issue. I'v varied anything i know to have an effect including: retraction speed/distance temp Acceleration extra prime amount linear advance etc. But none of them seemed to touch the issue noted in the test situation without being taken to extremes.

So, I had been seeing some under-extrusion at the start of some lines after travel moves. So I started testing to try and replicate it in a simple to repeat test print. I first thought it was just filament oozed away on long moves, but in my testing i rules that out as the culprit by printing 4 single wall squares far apart. Three out of the 4 squares looked fine, no matter the distance between them, but the 4th one was consistently under-extruding at the start of each line. Then i realized I had made a small mistake when setting up the test, I had been scaling the model i used to set up the test by 175%. But i had accidentally set one of the squares to 150%. The one square that was printing poorly was the one AFTER the 150% square. So, this made me wonder if the issue i was seeing in the test print was a result of cura attempting to print the lines differently because the scale of the model called for different thickness walls (though still only one line). Basically my thought was that the pressure was lower after the 150% square, so after the retract and travel, the prime was not enough to get back to the required pressure for the line size of the 175% square. So, I set up a new test, with 2 squares at 150% and two at 175%. Sure enough, the 175% squares now both had under-extrusion. I have attached images of the initial issue that started my testing, an image of a test print with the latest testing setup, my cura settings file, and the gcode of the final testing setup shown in the picture. I have been playing around with this, and can't seem to think of a fix to the tested issue, or the initial issue (if they are not in fact related). Anyone seen this and know what im looking at here? 😄 A8_Testing_squares.gcode A8 - Fast.curaprofile