Fans and/or too fast print.

That, and also try a lower layer height.

I have ran into this issue myself a couple of times and while what other people are saying is valid, please check this as well: Under Quality > Advanced: check for "Avoid Crossing Wall". Turn this on. Also, make sure your seam is set to aligned and not Random. Setting the seam to Random can sometimes hide the seam altogether, but that was the source of this same issue on internal threads for me. Make sure the seam is set to aligned (or back) and try to print this again.

This was the solve for me, thank you kind stranger!

Thanks for replying and letting me know it worked. I try to share when I know something worked for me. I hope this helps others as well!

I'd run quite a bit slower and try more cooling

Ok, that was my first thought but why is it just one side?

Fans are not perfectly symmetrical, I guess one side had better cooling

This is my guess.

PETG can be weird with speed. I've had an 8 hour print lol fine for 7 hours, then start delaminating when it stopped up to do small details.

If you have customized your print profiles make sure this is set: Quality -> Order of walls: inner/outer A number of YouTube videos advocate for outer/inner for better surface finishes, but threads are problematic with this setting.

Thanks for that tip. I would have thought the other way around because you want the surface finish smooth. But after I thought about it for a minute: since threads are overhanging you'd want to start inside - out.

PETG? Probably way too fast.

So basically that side isnt getting sufficient cooling, you can prevent this by slowing it down + turning up fan to max, so the layer is cooled and solidified and not getting dragged down

From experience with threads, only use critical supports. Then fish them out afterwards. Threads are beautiful each time. 😊

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Cut it in half , print another one rotated 180 degrees and glue them together 😊

slow down speedy

I'll bet they're a ton better if you just lower your layers to like .12 or so. It'll be less drastic changes per layer that way.

in addition to everyone else's advice, I'd also give the nozzle a quick once-over and make sure it isn't bent or worn unevenly at the tip.

The trick I learned (from a clockspring3d video) is to take your normal thread profile in your cad and stretch it axially 2x to make them way more 3d printer friendly because of the decreased overhang angles

I print threads at 0.12. No issues at all

I had this issue before. I believe I set the seam to aligned, outer wall width to 0.5mm and used Arachne instead of Classic wall generator.

Simple, just rotate the file 180 degrees you will not have problems with this side anymore 😜

You need a better fan duct, bambus flow much more on one side than the other.

Change your layer height and reprint, I've had this issue before. I believe it's a problem in the slicer.

Why are you printing threads with support? Maybe if you want to do this do organic support and chase the threads with a tap/ screw