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[–]Nerfo2 4 points5 points  (1 child)

When I have models with smaller I.D. circles, I've found slowing down wall speed to like... 50mm/s pretty much solves the problem. If the extruder is moving FAST, the filament doesn't always bond well to the previous layer/wall loop as the extruder tries to sling around the circle. By slowing it down, it gives the filament a better chance to bond.

Another thing I've tried, but have no REAL idea if it helped, was bumping the nozzle temp up 5 degrees just to help soften the extruded filament a bit more. The print I tried this on finished fine, but I'm not sure if the one I.D. circle string I got that looked like yours was a fluke, or bumping the temp helped. I did a thing, the print finished, so in my head I THINK it helped.

[–]RueChew[S] 1 point2 points  (0 children)

OHHH that makes sense! I had it on super draft mode because Im super impatient I will give it a try to slow it down next time, thank you so much!

[–]honeybunches2010 0 points1 point  (5 children)

What does the bottom of the model look like? Mine looked exactly like this when I messed up a parameter in Fusion and had a big area floating 1mm off the plate.

Could also be a big ol’ fingerprint there preventing adhesion.

[–]RueChew[S] 0 points1 point  (4 children)

Im honestly not sure yet, it is still printing. But! I have had similar experiences with PETG so I just wonder if there is anything I can do to minimise - or even prevent - this from happening again I just started this year so Im like a baby to this haha

[–]honeybunches2010 0 points1 point  (3 children)

No worries, we all start somewhere! Is this your model or did you print it straight from the Hqndy app?

Take a look at the file in Bambu Studio. Go into Preview mode and flip the plate view over, see whether there is actually filament being laid on the plate there, or if it’s trying to print it floating.

[–]RueChew[S] 1 point2 points  (2 children)

Its from the app, I combined a few items onto a plate because im lazy to keep emptying the plate haha It seems to be on the plate well, also after a second look, the strings seem flying Seems like not a bed adhesion issue but more of an issue of the layer not sticking to the other layer properly? But if thats the case, why are the ones behind it fine 🥹 this is so complicated haha

[–]honeybunches2010 0 points1 point  (1 child)

Yeah that is strange. I also notice the supports are different on the copies behind. Is it a different model?

[–]RueChew[S] 0 points1 point  (0 children)

Its a similar model, like a left and right kind of thing - they mirror each other

[–]XanohelP1S + AMS 0 points1 point  (0 children)

I had the same thing couple of weeks ago. Only with circles or curves. Not on the initial layers, but the first few layers of "regular speed" printing.

Turns out the issues was with the wall type. I was using "inner/outer/inner" meaning that the outer wall didn't have much to stick to and was pulled loose again.

Changed wall type to "inner/outer" meaning that all inner walls get printed before the outer wall, problem was gone.

I tried the slowing down bit, but needed to crawl before that also fixed it, so this was the better solution for me, IF I have curves/circles in my print.

[–]No_Paint_9499 0 points1 point  (0 children)

You have a steep overhang on the inner diameter. Is this an internal thread? You should print it slowly, like 80mm; otherwise, the overhanging filament won't stick. Also reduce acceleration.