Awesome, thanks for the picture. That looks like over-extrusion to me. Could you try to re-run the calibration in Bambu Studio?
From memory? You need to calibrate the filament using the printer. Your picture shows an over extrusion problem.
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Also start with a temp tower. That just looks like entirely uncontrolled flow.
I have run the Bambu Studio calibration 4 times now, on 2 different eSun PLA+ reels. The results are the same k= 0.02, Flow = +5 and 0 (0.98) although none of the flow results were particularly smooth, all had lines and rough edges. I was also wondering about the temperature. eSun works best at 218/220C on all my other printers and 220C is the Bambu Labs default temp, but the print looks far too hot or not enough cooling (Fan on 100%). Not good for a printer that is supposed to be plug and play. I am going to try again later today using the Bambu Basic filament supplied with the machine. I have also raised a ticket with Bambu Labs and await their reply.
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As it looked like too much heat I removed the printing head cover which came off with a loose wire, it looked as if the cooling fan wasnāt connected. Is this possible? Anyway I reconnected the cable to the board (poor fit with the cables hitting the plug underneath) and printed again. This time the results were much better (but not perfect). I did the Calibration again and again the results were 5 and 0 and 0.015. I am now reducing the flow rate down from 0.98 to 0.97, 0.96 etc and am getting better results. I am also reducing the temperature from 220 to 215. The result as shown are now more acceptable but still fall short of my other printers, especially the Prusa M3 and Mk4 which produce a lovely smooth top finish. Will keep trying different settings as the Bambu Calibration settings seam a long way out (also I get the same calibration results using a range of different filaments, and the same values as somebody else on YouTube showing how to do it!).
Rather than re-printing your model multiple times with different flow ratios, download OrcaSlicer and use the flow rate calibration from the top menu. It will show you the effect of a range of values and let you tune the rate even finer than the Studio calibration.
It takes a little time and filament, but probably less of either than printing your model just once. You can then use the value in Studio or OrcaSlicer.
OrcaSlicerās temperature tower and pressure advance calibrations may also improve overall results.
Great advice, thanks.
I have loaded Orca Slicer and the results are the same, regardless of k value the flow test comes out with the smoothest print with a value of +5 and zero. The temperature tower doesnt show much difference between the temperatures, any differences appear to be random. The top part which should be the coldest shows the most stringing so I am not convinced the heating or cooling is working correctly. Any ideas
I have a new p1s and Iām having the same consistent underextrusion issues. Iāve printed test squares anywhere from .9 to 1.3 EM and still get underextrusion. Iāve also reset the machine since it took a firmware update when I first got it. Nothing looks wrong in the extruder, gears are clean, so not like the filament is skipping and being chewed up. I may try rolling back the firmware, but Iām at a loss. Iām not new to tweaking profiles, Iāve done it with my Voron and Annex printers, but this is stumping me.
Tried to upload photos but it wonāt let me. It looks like your typical under-extrusion hatch type pattern.
It looks like maybe I can attach images now, here are what my prints look like. One of these are at 1.3 flow, so defnitely should be pillowing, not showing signs of under-extrusion still.
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Had similar looking issues with my top layers, like overnight.
It printed almost normally, but not the top solid layers and the infill was a bit fuzzy, too.
Tried tightening the belts, cleaning everything, checked the condition of the ptfe tubes and even their length, calibrating again and againā¦
Turned out, it was a bad contact on the extruder fan plug. Pulled it off and plugged it in several times and it worked. Did not even realize, that the printer was less noisy, while producing bad printsā¦
Now itās blowing away like crazy again and produces nice prints as usual.
Maybe itās an electric connection problem with yours as well.
what do you mean 0.3 for top surface? Mine is already set to 0.42 by default
@Drazel or @push did you ever figure it out? My flow calibrations look identical to yours, Drazel and other square test prints look like yours push, since Iāve started having this issue.
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im having the exact same problem too, its been flawless and then all of a sudden its getting the rubbish top layer, looks like loads of little squares, no calibration helped, outside layers are perfect and same for the bottom layer, only ever the top layer.
did anyone find a fix?
thanks
Im still fighting! Please check that option: If you have P1S or P1P with Aux Fan assembled then try to just turn it off in filament > colling > aux fan option. Just change that value to 0%. It works in 2 of my 3 printers with that problem. Weird but true ;p
Many thanks for the tip about the fan. It also failed for me, then I unplugged it and plugged it back in and thought the printer was running again.
Unfortunately, I noticed that the surface is still very rough and poor.
I have already tested several filaments. Calibrated the filament, calibrated the flow rate, completely recalibrated the printer. Changed the nozzle.
Performed maintenance on the printer.
Unfortunately, the quality is no longer usable.
What else can I do? This is frustrating.
@spaxi82 I had a similar problem with PLA+. Everything was printing fine then I started getting a bad top surface similar to your pictures. I made the following changes in the filament settings and now my top surfaces are much better. Not sure if this is the same problem, but here are my changes:
Basic Information
Flow Ratio 0.97
Print Temperature
First Layer 216 Other Layers 210
Max Volumetric Speed
16 mm/s
Nope, I ended up returning my unit since I was within the 2 week window at microcenter. I ended up getting an x1c since they were out of the p1s and havenāt had the issue on this machine, and iām about 500 hours of machine time now.
For me it ended up being a faulty x-axis carbon rod assembly. I worked with support and they detected āexcessive frictionā from the logs. They sent me a new x-axis carbon rod assembly and many hours of painstaking labor later, it is back to normal. Hope that helps someone else!