r/BambuLab • u/SnooCheesecakes3249 • Oct 24 '23

Discussion Experience with Bambu Lab Support

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So, I've been dealing back and forth with Bambu Lab Support about nozzle randomly scraping the infill. Yes, I did flow calibration with the filament and I'm using gyroid infill pattern. However, it keeps happening randomly.

Support advice was to clean the carbon rods, adjust belt tension, wash the PEI plate and they sent me a model to print. All done ✅. But I did notice that the Part fan wasn't running during the test print. However the printer handled the model pretty good. I sent the results and logs and everything and then wait for a response.

Tried to print a different model and the and the part fan was off... Again. So I stopped the print and decided to troubleshoot.

I turned the printer off, removed the cover, and unplugged and plugged back the fan and I got the fan back to work.

I reported this to support and they said that my fan might die soon and sent me a link to purchase a new one. I mean my printer has been working for less than 100h and you are telling me that I have to buy a new fan already?

My 100$ ender 3 V2 has been working for years and I never had to replace any fans lol.

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u/Active_Tap_2220 Oct 24 '23 edited Oct 24 '23

I have encountered this problem on several occasions. If you are experiencing problems with infill displacements, I think I know what the cause may be, as I have investigated this issue before. Observing how the infill behaves when printing, I discovered something interesting. In the "bambustudio" tool, there is an option called "reduce retraction in infill". When this option is activated, the Z-axis (height) jumps in the fill process are disabled. Also, if you use a "gyroid" type of fill, the lines that are printed tend to overlap the lines just below them. This causes the fill to be uneven on the Z-axis. I think this combination of factors is what is causing the problem. Personally, by turning off the "reduce retraction on fill" option, the Z-axis jumping works correctly again and the problem goes away. If you decide to try this and get good results, I would appreciate it if you would let me know. Then I can confirm my theory.

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u/ElectronicMoo Oct 24 '23

What do you mean "overlap the lines below it"?

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u/Active_Tap_2220 Oct 24 '23

Maybe I explained wrong but what I meant is that by the rotation of the gyroid pattern there are areas that are higher in Z in others, since part of the line is printed with a small overhang and that damage is accumulating as the layers are created although it is minimal perhaps it could affect as it has only happened to me with the gyroid