P1S trouble printing gear model

Bambu Lab P1 Series Troubleshooting
1

Hi,

I try to print the following model of af bevel gear:

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While the bottom part prints fine, I have trouble when it comes to the “pins” on the surface.
At some point the printer stops extruding filament, and makes some thin strings instead:

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It looks like the nozzle clogs, but if I restart the print, everything works from the beginning of the next print.

I have no problems with other models, only this one.

The model has a lot of places that needs very small amount filament, so I think it is doing a lot of retraction in the layers where this happens. Like in this layer, where there a lot of very small blobs below the first 3 lines from the top:

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I guess that large amount of retractions in short time in some way stops the flow of filament.

I tried various layer heights, with or without arachne (with eliminates a lot of “gap” infill), different filament, different temperatures. I did calibration of temperature, k factor, flow ratio and flow volume. Everything is more os less spot on on the default settings for generic PLA.

Any ideas as to what to try next?

2

Ok, tried printing with the included Bambu Lab PLA Basic filament, and the model came out great without any major issues:

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Can the problem with my old filament be moisture?
Do you think it will help drying my filament?

3

I would do the following:

  1. dry the filament (even if it’s pla)
  2. create a tuned profile with orcaslicer by running through the main calibrations.
4

Yes, moisture is critical.

1 Like
6

Tried drying the filament for 6 hours at 45 deg C.
It did af few more layers before clogging, but the print still fails.

I a wrote initially, I did a full calibration in orca, so I think the profile is ok. Also I have no problem printing other parts. Only this one keeps failing.

Will try some other new out of the box non Bambu Lab filament. Hopefully that will work.

7

With a new spool of filament it came out perfectly. So apparently the first two spools I tried have some problems. But I’m happy that it finally worked.