Unfortunately, the layer time prediction given in Bambu Studio does not correspond at all to the actual time required.
The image predicts a layer time of 3.3 seconds.
If you calculate the layer time, you get the following value:
The entire component, consisting of 385 layers, takes 107 minutes. 107*60/385=16.7 seconds.
Is there anything you can do to ensure that the forecast times are correct?
L.G.
Frank
Its done when its done
First layer takes longer and I believe the last layer takes longer also did you factor that in your math?
So you tweak a print to always the same layer time, and it’s wrong?
If so, can you please share more details? E.g., print size and shape (I suppose you are using a cube), speed settings at the first layer, so I can try to replicate the issue and understand?
I never assessed the accuracy of BL layer time, but I also never printed any model with identical layer times; e.g., the first layer is slower, the shape is complex, the number of walls in the top layer is different, the top layer is slower, infill and solid layers, etc…
I didn’t specify any timing.
I simply sliced a component.
It’s not a cube, but unfortunately I can’t show the entire file here.
Then the “Color Scheme panel” shows me a color code in the Layer Time tab, which in my case represents almost all layers (except the first) in the range between 8.7 and 5.5 seconds.
However, if I count the time, needed from layer 130 to layer 139, I measure 3:30 minutes - 210 seconds. If you then divide this time by 10, this results in 21 seconds per layer and not 8.7 or even 5.5.
If you still have any questions, please feel free to ask.
I will be happy to answer these as best I can.
L.G.
Frank
But you did! You showed the whole print in the multiplate window. Upper right hand corner.
FYI for your files security.
What is that “multiplate window”?
I just loaded up a JPG-Picture.
L.G.
Frank
My bad i was thinking you had more than one working build plate in Bambu Studio.
After you sliced your project. There is a small grey square that shows your project you are working on. Its small but you can see the whole file.
Thats what i was talking about showing the whole project.
Hope this clears the confusion. 
Hi,
Thank you for sharing.
I am trying to check it in a cube.
So, my preliminary results for a cube sliced into 64 layers showed 1359.7 seconds (22 minutes and 40 seconds) for the sum of the individual layer time values. The print time estimation is 22 mins and 34 seconds, resulting in an error of about 0.4%.
For a tiny slab (8 layers), the errors were higher, yet below 1%. The number of significant figures can justify these errors.
I didn’t test any complex shapes, as these tests consume time. But I will try to find the time for it.
I am just using the slicer values, not the measured ones. We may be doing it differently. How did you “count the time”?
I just summed the layer time in the preview window, e.g.:
@Barryg41:
It took me a while, but now I understand what you mean with multiplate window.
Sorry
Frank
I simply used a stopwatch.
As soon as the display switched to layer 30, for example, I started the stopwatch, then stopped it when switching to layer 40.
So I had stopped the time for 10 layers.
My error is around 200 to 400%.
When I look at your cube, the current layer is assigned the color code yellow in the “Layer Time” window.
Ok, with a cube each layer has to last the same amount of time.
In your example that corresponds to something between 7 and 9.4 s layer time.
In your G-Code, however, it is 20.8 seconds.
Shouldn’t the layer then be displayed in light green?
I also took a look at my G-Code.
My current layer is displayed in a color that corresponds to a time of 8.8 seconds. My G-Code then says 10.7 seconds. That would be close.
In fact, a layer takes 22 seconds (stopwatch).
Perhaps the pure component time is calculated in the color representation - without the support structures?
I’ll have to take a closer look at this…
L.G.
Frank
yes. You are correct. The layer colour doesn’t match the layer time legend.
I tested in ORca, and it doesn’t have a colour issue.
I never paid too much attention to colour values except to see if there were large discrepancies between layers of printing times. But I once waited for a print to finish to start another and remembered that the estimated total time (including the ending hour) was correct.
This, of course, is an estimation, but a 400% error is not reasonable. Next time that I am near the printer while printing I will try to take a look at this.
