DonutCables
commented
2 weeks ago I've also run into this same issue. In my case, on layer 49 of my file the outermost wall of the part is printed last compared to the inner walls on most of the part. It seems to happen when there's no single inner wall around the entire part due to other geometry in the part causing smaller wall sections. I've attached the project 3mf and gcode I'm seeing this happen with. example_file.zip
justr0st
Is there an existing issue for this problem?
OrcaSlicer Version
2.2.0-beta
Operating System (OS)
Windows
OS Version
Windows 10
Additional system information
No response
Printer
Bambu Lab P1S
How to reproduce
Open attached 3mf project and slice.
Actual results
Look at layers 2-17. On these layers, the 4 circular holes and the central large rectangular hole all have their outer walls (orange) printed last, after all the inner walls have already been printed. This causes all 5 of these holes to be printed ~0.2mm undersized (diameter) due to their outer walls being pushed out by the inner walls, just like with Inner/Outer wall order. This issue occurs with both Arachne and Classic modes.
If you change the wall order from Inner/Outer/Inner to Outer/Inner and re-slice, the problem goes away - the outer walls are correctly printed first and the dimensions come out correct.
Expected results
What I expect to happen when using Inner/Outer/Inner (IOI) wall ordering, is that outer walls should NEVER be printed after any directly adjacent inner walls, in order to maintain good dimensional accuracy and surface finish just like with Outer/Inner (OI) wall ordering. This expectation is reinforced by the wall order tooltip that describes IOI as being recommended over OI in most cases because it is supposed to have the benefits of better dimensional accuracy and surface finish like OI, but with the additional benefit of hiding seams better.
If for some reason the wall ordering algorithm cannot produce a result that does the above, then there should be an automatic fallback to use OI wall ordering on that particular layer/area of the layer.
If for some reason falling back to Inner/Outer (IO) is preferred, then I suppose there could be a user-selectable fallback option to choose between either OI or IO. However in my opinion, falling back to IO makes little sense in most cases since it seems like IOI is supposed to be like a better/improved OI, and by falling back to IO you would lose out on the benefits that you would expect from OI or IOI.
Project file & Debug log uploads
Bambu Lab P1S Camera Bracket.zip recent logs.zip
Checklist of files to include
Anything else?
No response