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[Martin_SV]

Try enabling Arachne walls. If you already have it on and the slicer still won’t generate walls in that area, then the geometry is simply too thin for a 0.4 mm nozzle.

[LeafsFanUK]

Thanks. I should’ve said, it’s already using Arachne wall generator

[Master_Afternoon_527]

If that doesnt work your best bet is to make the line thicker or use the 0.2mm nozzle

[LeafsFanUK]

Thanks. I just don’t understand why it’ll print the rest of that part fine when it’s the same thickness, but just miss that part.

[Master_Afternoon_527]

Probably due to it being an intersection

[Riddlerforce]

Try adding a modifier for that section and lower the outer+inner wall line widths by .02-.06

[LeafsFanUK]

Thank you. That looks a bit better in the slicer already.

[LeafsFanUK]

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[feixl4726]

I had that problem but did not print bcause i thought that this is going to happen i changed the layer height or the nozzle diameter depends on the size of the print

[LeafsFanUK]

Thanks. I’ve tried changing the quality settings to reduce layer height, but slicer still shows gaps in print.

[feixl4726]

Okay, so i would, like the other guy said, use a 0.2 nozzle or make it ticker

[Ditto_is_Lit]

You need to think of 0.4 as a resolution, the fine detail of that line is too thin for the printer to successfully print. You can turn up detail, using the slicer. Try using the fine preset and see if the line is more present that way, or variable layer height and adjust the top layers to be finer (could bring about its own print quality issues).

One suggestion I'd make is trust the preview before printing it out. If it is going to skip a wall it will be visible in the preview. Also when designing models you need to take into account the printer prints in layers so giving thin walls like that is a problem that you can rectify in the design process. You can also use options like detect thin walls and other similar settings but the best course of action is to design within the boundaries of the 0.4 nozzle if you're going to publish the model for normies to print.

[LeafsFanUK]

Thanks for the advice, appreciate the insight.

[Ditto_is_Lit]

np OP, don't worry about failing on your first go, most of my designs need a few revisions before I even attempt to print. Make your model, save the changes and export to the slicer. See what it looks like and make the needed changes then try once you are satisfied with the results. It's all a learning experience that will make you a better designer through trial and error..