What are the possible causes of these printing errors?
Material PLA, layer height 0.3mm, flow ratio 0.98 (after calibration), max volumetric speed 20, speed between 130 and 150, nozzle temperature 220.
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How does it look in the slicer? Need to see retraction/unretraction places and speeds.
But I would say underextrusion. Try with lower volumetric flow.
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Screenshot, close up of the sliced object in the most damaged area. You can see the flow exceeds the set for material.
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Are you sure that the right filament settings are selected? Maybe you have multiple filaments in the project and the wrong one is seleceted?
Are you using OrcaSlicer or BambuStudio?
If Orca, what have you set your seam settings to?
@Felippe I use PLA and PLA support, the right materials and settings are chosen.
@twack3r I use an Orca slicer.
Well, i do not know the orca slicer. But I think that exceeding the maximum volumetric flow should not happen. Maybe there is a setting to keep the speed rather than care for the volumetric flow, but that would be strange… We need some orca slicer expert :))
I made pressure advance test and change a bit in filament settings, also changed the flow ratio.
Will try again to print a part.
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I had the same issue. I installed the 0.6 nozzle in the machine and updated the setting on the machine screen to reflect that change.
I had added the 0.6 machine profile in BambuStudio but at some point when I reopened the file the slicer switched back to 0.4 profile.
The machine profile that you select does not seem to be synced or remembered between sessions or machines. So I just “uncheck” the profile I am not using when I switch machines.
On a related note, the machine will not warn you if you slice with a different nozzle than you have on the machine. It would be nice if they added this the same way it gives you the warning if the build plate in the machine doesn’t match the slicer settings.
The slicer will not exceed the max flow rate you have set for the filament. If you have not calibrated max flow rate and set it too high it will certainly try to print too fast.
If that is the result of your PA test then you should start over. First the temp tower, then flow, then pressure advance, and then max flow.
Some of those look great but others, such as the last, look terrible.
Photo 1
The lower part of the inset where the curve is jagged, can be smoothed out by using the variable layer height setting. In general curves/fillets look better with small layer heights.
Photo 2
The strange layer separation looks similar to poor bridging, but you would have had to print it upside down from the photo for that to be the problem. If you printed it as shown, then there is some kind of issue that needs to be resolved. I have never seen that before.
Photo 3
What a massive improvement from the first set of photos that your printed.
Photo 5
This looks terrible. Is it the top surface?
If so you might want to turn off the setting “only one top layer” and see if that helps.
I’m with Julie, after your recalibration things have improved, but the flow still needs some more work. If that is the bottom layer I would suggest running that test again, or just manually making your own tests. The first layer is the point that you should see near perfection and that’s not it. I’d say sort that out, before moving to the next stage.
The only thing that bothers me is the under extrusion appears to be very consistent (clear patterns). I’m not sure what is causing that, but I’d start with continuing to fine tune the flow. Maybe even just bump the flow up by .02 and just run the print’s first layer until you see the under extrusion go away. I suggest this method for those having issues with the flow math formula.
Also… are you still running bed leveling or are you bypassing it?
Looks like to me this is the top of the part ?
What were your current settings ?
Is the high speed or high flow pla ?
Set the volumetric speed setting to 17 = 102 mm/s
Set top and bottom layer 4 = 1.2mm
Infill 25 % or more
I think you only have 1 top layer ?
Is your infill set to 15 ?
You can also adjust top surface flow ratio if needed but need to know more information.
Thank you very much for your commends and the suggestions to improve my way of printing.
Photo 2 - the strange layer separation is pointing up. I don’t know why this happened, very strange.
Photo 5 - this is the last layer. I thing that is because of the big infill raster and the printer cannot support the printing material of the last layer.
I think the first, basic layer is not perfect, but good enough. Still it has need improvement, more tuning, but at the moment I don’t have enough time for more tests.
Every time I using bed leveling, but not every bed measurement is successful from first attempt.
One more time - THANK YOU for your suggestions !!!
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Each of the pictures show a massive under extrusion.
At most the last one with the toplayer.
Why do you reduce the flow ratio? This increases the under extrusion.
How did you “calibrate” that?
The step from 0.4 to 0.6 is not easy with bamustudio, because all settings are made for 0.4 and for speed not for dimensional accuracy or strength.
To get perfect results you need to make your own configs.
I would start with the calibration of the extrusion multiplier:
https://www.printables.com/model/327961-extrusion-multiplier
Based on getting strength and speed or still good quality i would start with a layer height of 0.44mm or 0.16mm. Going to 0.44 mm needs to respect the flow rate of the hotend.
So i recommend start with 0,16 mm for your settings.
I do not use 0.6 with my p1p but use it a long time with my mk3 where it adds a lot of speed.
There are 3d party nozzles for bambu on aliexpress (CHT like) which nearly doubles the flow rate, i would not go to 0.6 with a bambu without that.
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How does it print if you use the bambu slicer?
It prints nice but different filaments act different.
Is there any advantage to use orca slicer?