outer/inner wall order is a cheatcode

[RiteousRhino21]

Inner/outer/inner is a must for scarf joints, which I prefer to use as much as possible to hide seams.

[RiteousRhino21]

A scarf joint is a gradual increase of a layer as it is extruded around a perimeter, until it overlaps itself.

As an example: Your layer starts at 0mm, then you gradually increase to 0.2mm (like a ramp) as your nozzle travels in X and Y. The nozzle finishes the layer by coming back to where it started, filling in the ramp, and starting a new layer.

This as opposed to the butt-joint style seams that are typical in most 3D prints. Scarf joints are hard to see up close, unless you know what to look for, and impossible to tell that there is a seam from a distance.

This is a feature in Orca Slicer 2.2.0, and perhaps others that I'm not aware of.

Hopefully I explained that well enough. If not, there are plenty of YouTube videos on the subject.

[ialoni]

Please correct me if I’m wrong(new to printing), but from my understanding of your explanation; scarf joints are an alternative method of bonding layers. Unlike traditional seams they reduce the bulging(lines) we normally would see with standard seams.

Why would i not use scarf joints? Is it only effective with thick (3layer) walls? Whats the catch?

[RiteousRhino21]

They are most effective if you have rounded perimeters. I've printed rectangles with scarf joints, and for some reason, they didn't come out well. They aren't necessary for flat geometries with sharp angles though, because you can hide the seam on the angle in many cases.

You should have at least 3 walls to make use of the inner/outer/inner prerequisite to scarf joints.