Getting a weird “rough” walls on top 1/3 of my PETG print. I used “Generic PETG” default settings with adaptive layers. Seems to be related to the thicker layers. However, the corners of the thicker layers seem fine. And…it appears to print fine if I use PLA.
Any ideas?
Thanks for posting such clear evedince of what’s going on. Based on the photo and the flow map, it looks like that data is a smoking gun for max flow ratio calibration. This combined with the fact that you said you’re using the generic PETG settings is almost conclusive that these settings will not get you the optimal results.
Disclaimer: What I am about to share will be written for someone who may not know about Orca so please don’t assume that I am assuming that you are not familiar with this already but if someone else follows you who is new, this tutorial will help out even a newbie.
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If you haven’t already done so, load Orca Slicer onto your system. It is a fork of the Bambu Studio code so the interface is identical and the 3MF files are compatible. You may get some weird warnings when you first load a file if it was saved with earlier versions of Bambu Studio, just click past the message.
Within Orca there is a max flow rate calibration utility. Start up Orca without any models loaded. If there is already one loaded, Orca will just close it and start a fresh screen.
Do not bother with the Bambu Studio Calibration tools, in my experience they do more harm than good because they instill a false sense of confidence without producing decent calibration results.
This menu is only present in Orca Slicer, you will not find it in Bambu Studio.
The calibration sequence I recommend is as follows
- Flow rate
- Max flow rate
- Pressure advance
For the Max Volumetric Speed test (AKA Max Flow Rate)—I wish they would pick just one name and spelling and stick to it😉—for PETG, I would generally start at 8 mm³/s and end at 15 mm³/s. I say that because this can be a long test (>20 mm), and for PETG, you won’t likely get it to print faster than 15 mm³/s. However, in all candor, the new Bambu HF (High Flow) and Elegoo Rapid PETG both print at 23 mm³/s, so it’s a tradeoff on how much time you want to spend dialing in the perfect calibration. Your choice.
It will produce this pattern which will modify the GCODE to vary the flow rate over the height of the model. This would otherwise have to be hand coded.
The tutorial for calibration is in the help screen in Orca.
Here’s the link that it will lead to. Calibration · SoftFever/OrcaSlicer Wiki · GitHub
The best video I found that goes into this part of advanced filament tuning is from Butter Pocket Prints. He has two other videos worth watching but this one covers max flow rate in particular.
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