Question about different wall counts at different levels of the print

[Jetmech2002 0]

Hello, and thanks for the ad!  I have a question.  I have a model that is calling for two walls at the start of the print, then transitions to one wall, then at the top of the print back to two.  is there a way to set this up in Cura 5.4?

[Slashee_the_Cow 619]

I have no idea why you'd want that (one wall will make it fairly weak) but yes, it can be done!

1. Create a support blocker on your model - use this tool  on the sidebar and click anywhere on your model to create the blocker:
   
2. Select the move  or scale  tool and click on your blocker (if you're in support blocker mode and click one, it deletes it). Use those tools to move and resize (you'll probably have to turn off Uniform Scaling) your blocker so that it bisects your entire model at the layers you want:
   
3. With your blocker still selected, open the Per Model Settings  tool. By default it will be set to Don't support overlaps:
   
4. Click the third icon so it becomes a modifier mesh:
   
5. Click the dropdown that says Infill mesh only and choose Cutting mesh:
   
6. Click Select Settings, and in the box that comes up find Walls > Wall Line Count and tick it:
   
7. Close the settings box and now in the list of settings for the overlaps there's the wall line count, so set it to 1:
   
8. There is no step 8. We're done!

If you look in the preview, before (or after) your modifier, you will have whatever the wall settings for the model are (in this case, 3 walls):

But go up to a layer inside the modifier mesh, and...

BAM! One wall (in this case it's now just the red outside wall). There's an open bit where you can the three walls before the modifier but here, there's just one wall. (And please don't BAM! on it, 0.4mm of PLA probably won't survive a BAM!)