A1 mini printing on PLA. Regardless of filament, when the print reaches the point where it starts to print the first of the top layers (on top of infill), the print heard very loudly grinds against the previous layers.
Please see the video with sound on to appreciate the problem. Even when the noise is magnified (ii is recorded inside my printer’s cage), that doesn’t mean it’s exaggerated: it is a noise loud enough to be heard clearly from three rooms away.
The grinding happens will the three types of infill types I tried; the video shows it grinding with Adaptive Cubic, but is the same as with Gyroid and Grid.
As soon as the print moves on from the first top layers printed to the next, the problem goes away
maybe the flow isn’t calibrated right? If you’re extruding a little extra
Or maybe try printing infill with less cooling? The thought is you’re cooling your infill too fast, causing it to expand quickly. But I’m not sure about this one either.
I’ve noticed my A1 tends to barely scratch over infill sometimes as well, but not nearly this badly.
@Naeth, thanks for the suggestion. Checked flow on the filaments I used, they were all pretty much perfect (like, when you agonize between choosing 0 and -5) And also, it would be something that affects filaments differently…
I am now thinking that the slicer (Bambu Studio) has something to do with this, because I tried on my X1C and the problem there is even more pronounced, the print started being pulverized by the print head when it reached the end of infill (IKR???). Never seen this on a slicer (very, VERY simple model, printed with the outmost plainest settings) but that is the direction I am exploring next. Will need to download a different slicer and give it a try…
And cooling… I didn’t even think of that, because I have never in my five years of printing modified cooling (I am not sure I know how would I do it). I guess I may explore that, thanks for bringing it up.
It’s most likely to do with you infill type/settings
Always use gyroid unless there’s a specific reason not to and keep everything else stock.
If you’re running other brands of filament that aren’t Bambu, then just run them on the stock Bambu filament settings. I’ve yet to find a filament that doesn’t print well on the Bambu profiles, and they are faster than any of the ‘generic’ or other branded profiles.
Thanks, @Zurlingo-3D and @debonr - I tried 5 infills types, including gyroid, adaptive cubic, grid, linear and hex. It’s safe to say that infill is not the problem.
Just as I was re-slicing the model with Orca Slicer, I realized that I was printing with 0.12 layer height setting. Since I didn’t need the extra quality, ran it at 0.20 and it printed great. Printed the three copies I needed on as many filaments, all printed great (all using adaptive cubic infill).
I’d love to find out what else could be the problem (lower layer height sounds as a weird reason to solely produce the grinding), but I have other projects to move to, so I’ll move on. Thanks all for chipping in!
I’ve seen this issue reported frequently with small layer heights. Especially .08 and .12. I’ve never printed that small myself, only down to .16, which has behaved well.
Gyroid is definitely preferred, but you might also look at “Avoid crossing wall” in the Quality tab, and the Z-hop settings in the Filament settings under “Setting Overrides”
And also, it would be something that affects filaments differently…