Hello! Anyone seen this type of issue between infill/wall? I get over extrusion on left/top and under extrusion bottom/right. I’ve searched so many pages forums and haven’t seen any advice.
-Automated calibrations doesn’t help. I’ve tried several times to do manuelly calibration dynamic/flow with no succes.
-Ive done maintenance bed leveling several times. It doesn’t get beter where ever i print on middle of the bed or the corners.
-It’s PETG filament and its super dry. I’ve dryed it 15h+.
-I’ve tried to increase flow ratios and it just get worse. Tried to tinker with infill/wall over laps without any succes. The over extrusted part just gets worse or the under extruded part get worse. Its like chasing your own tail.
-Ive tightening the screws behind the extruder. They where tight.
I’ve spent several days on this and soon wasted 1kg of filament. Ill really hope someone here has some good advice. And yes the bed is clean. Ive probly forgot to mention everything.
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Sorry for being no help this time, but I have absolutely no clue. The only thing I can think of is asking the Bambulab AI on Bambu Handy.
Hope this some what helps.
Thanks,
OTpandy1
There is not neccessarily anything wrong here as it is an optimzation problem rather than a problem to be eliminated. A round nozzle will always leave gaps when approaching a straight edge.
You can try to optimize it further but usually, the defaults (15% wall overlap, flow = 1 for the initial layer) work quite well. The second layer usually hides those cavities.
Of course, using a smaller nozzle would also give smaller gaps.
But saying that, you can experiment a little with different 1st patterns.
- It looks like you are using “Monotonic line” for the 1st layer.
- Maybe simple “Monotonic” gives a somewhat better performance?
- And then there’s of course “Concentric”. I like that a lot as long as there are not many features on the lower surface.
- Others are quite fond of the “Archimedan Chords” as it is cleaner with lots of features and extends from the inside outwards but it can lead to larger gaps which in turn need to be addressed with the “Arachne” wall generator.
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Thanks alot! You’re correct that its monotonic line on the top. I will try to mix with infills tomorrow, i feel quite dumb for not trying. Iam sure intried monotonic also which gave me gaps also. But ive to refreshing my memory. Ive over worked this, hopefully sleep will help. I’ll will return to this tomorrow.
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I’ve tried to use monotonic on top now. It actually looks the same as monotonic line. I will try to increae infill/wall over lap to see the difference. I’am sure it will make the over extrusion part worse.
Now I’ve tries to increa infill/wall overlapp from 15% to 40%. Those holes is almost gone! Even thought i dont like the “over extrusion” on left/top, now atleast the bottom has some also. I’m actually fine with this. Might try 50% but soon i’am touching the limit?
I’am greatful of your help @EnoTheThracian ive had so many bad suggestions on other facebook forums. This is a small pile of all tests ive done…
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Glad to have been able to help 
The top picture shows what appears to be some loss of contact to the build plate.
So it may be time to give the textured plate a good scrub (or three) with Dishwashing liquid, water and a clean brush. Residue tends to accumulate in the valleys of the plate, making this neccessary periodically.
Happy printing,
Eno
I have reverted my A1 from the 01.04.00.00 to the 01.03.01.02 firmware, and the quality seems to be back to normal.
That’s the issue have/had/have with over extrusion on the left/top while bottom/right looks abit under extruded.
I’am sure ill don’t issue it doesn’t stick with the bed. I’ve done 25+ samples 50/50mm2mm thick all are the same 
I always clean with hot water/dishsoap dry it with paper, then final clean with isopropanol.
I’ve already committed to live with this “issue” to work around it instead.
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Well, it is warping off the bed. Not much of a problem when you plan to print only 2mm thick squares, but for actual prints it is likely to lead to ugly surfaces and overhangs, lost prints (in particular but not only when using supports) and bent nozzles (AMHIK).
So I can only advise to look into bed adhesion on one hand and warping/curling prevention on the other.
Try the other way round. First a generous amount of Isoprop to help dissolve residues, then (while still wet with Isoprop) warm water, dishwashing liquid a clean brush and muscle grease. That’ll work much better. Using the Isoprop last will only smear post-washing residue into the textured plates cavities.
That’ll probably become problematic at 5mm and more… Warping is a result of a layer cooling (and hence shrinking) on top of an already cooled layer. It can not be avoided, just minimized. And it gets worse A) the larger the cooling gradient is in the part and B) the higher the part is.
I will try your advices. Maybe ive had warping issue from the beginning?
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Not in the original pic’s. That was the nozzle diameter hitting a straight line. The last image shows a bed adhesion issue that becomes apparent when further layers are cooling (i.e. mild warping).
Happy printing,
Eno
Hello all
I dont know if this is the same issue but i have the following problem with my prints to be frank i dont even know if it is a problem since i am very new to 3d printing
i bought the mambu a1 ams light combo 10 days ago and i have been trying it out. After i did the initial calibration i printed a few files and everything came out great. The printer does a line before starting, this line at the first 4-5 prints was very straight and uniform. After that it started becoming very incosistent starting very thick with a flactuating thickness. The print quality though was good at least in my inexperienced eyes.
I tried to recalibrate and do the flow calibration as well and i’m posting the results. I also applied some oil on the y axis.
Are these results normal is there something i am missing ? and is this the best results i should expect ?
i am using bambu pla matt
thanks in advance
It’s not warping. If you look at the laat pic bottom and sides there’s over extrusion. But the light just hits different on the top (silver petg)
Ive found a quality that im fine with. ( i had abit of overall over extrusion). I’am greatful of your tips!
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I think that it should be possible to improve on these results.
Did you dry the filament yet? Having travelled the 7 seas, it is quite common for new filament to have quite a bit of moisture in it which may explain the print quality.
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thanks for the replay. No i dont have a dryer 
i will print the boat and post the results for better reference
Actually, you do have a dryer: You can use your printer to dry your filament.
That will be a better use than doing the benchy with filament that is likely moist.
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should i use the bed at 60-65 ?
Yes. That’ll work nicely. Use the cardboard package as a lid and flip the roll once half the time passed.
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