Increasing the speeds with several components on the print bed

Bambu Lab X1 Series Bambu Lab X1C
1

I would like to understand the interrelations better:
Why does Bambu Studio increase the speeds when there are several components (after cloning) on the print bed?
See also:
https://forum.bambulab.com/t/cloning-problem/26494
L.G.
Frank

2

It’s reversed. The slicer define the print speed based on the print and filament settings. If you take a look at the filament settings you will find an option called “slow down for better cooling”. If you deactivate this option, the 2 clones will be printed as fast as the settings allow. But the filament needs time to cool down to retain its final shape. If you print a large model, the printer can print very fast, because it needs more time to complete the layer. On small models, like your 2 clones, the printer will complete the layer very fast, so fast, that the filament not can cool down enough. For that reason, the slicer has the option “slow down for better cooling”. And this is the reason, the printer reduce the print speed for small models.
My hint, to slow down the print speed for your print of 10 clones was only a workaround to get a good result without calibration, because we knew that slow printing worked. Normally you have to calibrate the filament to get the best results for your print. There are different things, which normally should be calibrated:

  • K-factor (X1 does it via LiDAR)
  • (dynamic) flow / pressure advanced (X1 does it via LiDAR)
  • maximum flow
  • temperature (using temperature tower)
  • retraction

Yes, Bambu Lab has filament settings for their filaments already in, but I think that they also can improved by calibrating them by yourself. Personally I’m not using Bambu Lab filament, because the quality isn’t as good as it should be for this price.

3

Conversely, does that mean that a reduction in print speeds would not have been necessary if a (properly) calibrated filament was used?
Answer: as soon as the filament is calibrated, the 10 valve caps can be printed without errors at 300 mm/s.

Valvecaps-calibrated
Valvecaps-calibrated1920×1050 167 KB

Ok, I now have a rough grasp of the connection between cooling and layer time.

Actually, the filament was already calibrated. You only have to select the calibrated filament in the project.
Today I recalibrated the flow dynamics and the flow rate for the entire content of the AMS (2xPETG and 2x PLA) again.
The Flow Dynamics calibration reports A1 0.048 and A2 0.047 for the two PETG filaments.
Thanks again
L.G.
Frank