Arak0n

Thanks, I'll try those. However, what's wrong with coasting? As far as I'm aware, that should reduce blobs at the end of a line or layer change, no? I'm not using linear advance on the printer.

Ah, sorry. Here you go. CE3_Mendel90_BFPTouch.3mf

Attached. CE3_Mendel90_BFPTouch.3mf

Got an even better picture. First layer. You might say it's bed leveling, but I'm using a BLTouch and the issue wanders if I rotate the model. Adhesion is bad cause the lines are so thin and have barely the surface to attach. On top of that, it also happens if I print on support, so it's not "lack of squish". Mind you, I can close the gap by making the nozzle drag on the bed, but that's kind of not the idea. It's literally drawing two very thin walls around the hole and completely skipping the third wall., even though it's showing in the slicer. But not on all holes, and you can see that other lines around it were drawn together properly.

I unfortunately see this exact same issue. It may be related to how using a concentric pattern on top and bottom will also leave very specific gaps, causing a flat print to have "hinges" cause there's a gap through the entire print. 90% of the circles I print on 2 very different printers (Mendel90 and Ender 3) exhibit this issue, no matter the settings, originally in Cura 4.1.0, still happening in Cura 4.6.2 now. Note the peg on the left.. it drew 3 very distinct, seperate lines that are much smaller than wall line width. Right hole, also gaps.

To report back: It works now. I honestly have no idea why it didn't at first, the only explanation I have is that the first times I tried, when homing, the limit switch didn't trigger, which caused the Z-axis to refuse moving (this seems to be a safety setting in the firmware). After coming back home yesterday and doing some more adjustments, the printer now prints fine in Cura as well as Slic3r, and I'll be replacing the endstop switch just to be on the safe side.

I was going to try Cura after a very long time (I usually use Slic3r). However, it seems that in Cura, the Z-Axis for the Mendel90 is inverted.. i.e. it will print at the top and at the end of the print, lower the extruder to the bed. The Mendel90 has the endstop switch for Z and the home position for Z at the top. It works fine in other softwares, so I can't imagine this being an error with the printer. I found absolutely no settings for this. It worked fine in a very, very old Cura version, if I recall right (14.xxx), but not since the complete rework of the program. Anyone have any idea on how to fix this?