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That's it! I don't even remember turning it on, but it's off now, and the GCode output is now looking exactly as expected. Thanks for your help!

Thanks for the tips, gr5. Unfortunately, they don't appear to be the cause of my problems. There are no red or brown colours in the x-ray view, and it's not fixed by changing the line widths to 0.2mm. I have been trying other models, including ones that I have successfully printed last week (a 20mm calibration cube), and they are also getting holes in the walls, makes it look like it's something in Cura, and not in any STL file. Could I have ruined a setting somehow?

Hi all, I'm a newbie to Cura and am trying to slice a simple model from Thingiverse in Cura 3.4.1, but the GCode that it's generating has a gap in the wall in one section of the print. I verified that the gap exists via an online GCode viewer, so it's not a glitch in the display of the GCode itself. I have tried changing many settings as well as restarting Cura to no avail. I have not seen this in any other models I've sliced so far. Is this a problem in Cura, or something I need to do differently? Thanks! CactusPot.stl Cactus Pot.gcode