P1S Vase Mode Nozzle Buildup

Bambu Lab P1 Series Troubleshooting
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Hi Folks!

New to the forum, new to Bambu’s, but not new to 3D printing having had a few Prusa’s over the years.

Loving the Bambu P1S so far, but have encountered some troubles printing in vase mode which I’m hoping you can help me out with.

I’m getting excessive filament buildup on the nozzle, which eventually falls off and embeds in the print ultimately ruining it. This is only occuring when printing in vase mode.

I’m printing using PolyTerra PLA, have tried several different models and have currently resorted to a simple cylinder shape for troubleshooting and getting this sorted out.

Details:
Filament: PolyTerra PLA white
Nozzle: 0.4
Slicer: Orca
Slicer settings: standard PolyTerra filament profile, standard P1S profile 0.4mm nozzle

Things I have tried:
Reduce print temp: the standard profile temp is 220c. I’ve reduced this all the way down to 190c. This did have a positive effect on the amount on buildup on the nozzle, however getting down this low I’m seeing layer adhesion problems between the base layers and the first vase layers.

Flow rate calibration: I checked the default flow rate for accuracy using the cube test, which confirmed the standard profile settings were accurate. (edit, added)

Reduce flow rate: no effect, even at 0.75 I’m still seeing nozzle buildup

Increase Z offset: added 0.01 Z height offset to lift the nozzle a bit higher. I started at 0.4 offset and reduced until I had a well printing first layer. Still, I get nozzle buildup.

Reduced print speed: down to 50mm/s, buildup still occurs.

This buildup is only occuring to this extent on the Bambu printers. I have a couple of Prusa MK3s’s which I’ve been testing the same models on and I’m not getting any nozzle buildup (or very minimal) on these.

At a bit of a loss here and could really use some help!

Thanks

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Don’t mess with flow rates and such - calibrate them instead :wink:

For vase mode calibration you simply do a little cylinder and measure the wall thickness.
Let’s say your flow ration is set to 0.86, you use and wall width of 0.5mm and the print comes out with just 0.43mm walls.
0.86 divided by 0.43 and then multiplied by 0.5 gives a solid 1.0 for the correct flow ratio.
Print the cylinder again to confirm/adjust slightly.

After that you should be able to print with more than 200mm/s in PLA doing vase mode and that without defects.
Keep in mind though that the flow ratio calibration for vase mode differs from normal, so create a vase mode profile for the filament or not the values for reference.

1 Like
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Thanks for the reply!

Apologies, I neglected to mention in my initial post that I did calibrate the flow rate in a similar manner suggested - single walled small cube, measure each wall thickness and take average etc…
The result of this found that the default flow rate was bang on as far as dimensional accuracy goes.

We did have some further findings today - we found the issue is specific to matte filaments, or at least to Bambu Matte and Polyterra Matte filaments.
Printing with Regular eSun and Bambu PLA found the issue resolved, along with a significant improvement in layer adhesion.

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Shows again how different filaments can be…
Thanks for reporting back!