I just noticed in Bambu Studio, that the speed presets do not change while changing filament type.
For example, I select Bambu PET-CF in BS, for a print job, and the speed settings do not change from what they were using for example PLA.
ie. Outer wall 200, Inner wall 350, etc.
However, on the Bambu website, it states to print PET-CF with the following settings:
Print Speed < 100 mm/s
I could understand that for a different / unknown filament - and I would have to set up my own custom settings, but when using Bambu filament - the settings are “preconfigured” in BS. But for some reason, speeds are not.
Why is that?
Can Bambu fix this in the next firmware release?
2 Likes
The filament settings are just one part of the setup. The process settings are just a generic starting point for you to modify and save as your own process preset. From what I understand.
I get it. And I agree - i need to be able to adjust those settings.
But the Bambu store sells their filaments on The Basis that the printers and settings are optimized for their own filaments.
This is straight out of the Bambu FAQ:
"Does the X1 Series support third party filament?
Yes, you can use any filament you like. We recommend using Bambu Lab filament in most situations because all the parameters of material setting such as temperature, cooling power, printing speed have been optimized based on our materials. Other 1.75mm 3rd party filament can also be used, but we’re unable to guarantee print quality and performance."
1 Like
Although the speeds in the print setting, for example .4mm standard P1P, do not change with the change in filament, the filament settings modify the speed settings.
Leave the print settings at on preset. Select a filament, such as PLA and slice the model. On the slice details select speed.
move the slider to look at different layers and parts of the model. You will probably notice that not much is actually printing at the speeds you see in the profile.
Now select a different filament profile, such as petg or abs. Slice it and look at the speeds.
You will often find that the real speeds are based on the profile, modified by the filament settings and the model geometry.
If you print a tiny part where the layer prints in < 8 seconds you will really see the speeds slow down.
The max volumetric flow for the filament may be limiting, but more likely you will see the cooling cause the slowdown.
To give you an idea, I just changed my filament volumetric flow max from 19 to 9 and here is the result.
None of the print profile settings were changed, only the filament.
1 Like
Does the slicer handle the lower max volumetric speed by scaling or by limiting?
I don’t know what you mean by scaling.
You can see in the images that I posted that when I changed the filament max volumetric flow that the speed of the nozzle movement while printing is much slower.
Oh, by scaling I meant that the values would be reduced proportionally, so if the original speeds were 50, 100 and 200 (maximum) and you slowed it down 50%, the speeds would then be 25, 50 and 100.
By comparison, limiting the speed to 50% of maximum would result in speeds of 50, 100 and 100. Hope that makes sense.
I think it just calculates the flow rate as it generates the gcode and if the flow rate > max then it reduces the speed to keep it below the limit. There would be no reason to slow down when the flow rate is below the max.
True, just limiting the max speed would be the most straightforward method.
perfect. thanks.
I printed the part with whatever the settings the printer wanted to use - for PET-CF - and the part came out perfect…
