How to slice thin curved wall I'm trying to print a part with thin walls. I've designed it with wall 1.2&nbsp;mm thick, so that I should get three 0.4&nbsp;mm lines. This works just fine for the straight lines, but for the radiused corners, Cura 4.3 insists on trying to print infill. This infill is only added where they are going at a tangent to the curve, so it alternates corners on alternate layers.



Worse, it prints the segments entirely out of order, which adds lots of travel and hence print time.

I've tried setting the infill to 100&nbsp;%, setting the wall thickness directly to 3 rather than the default 2. I've tried reducing the wall thickness by 0.2-0.3&nbsp;mm. I've tried a few other things too - all to no avail.

Some layers it gets right:

So why can't it get them all right??

I presume that this is probably caused by the fact that the curves are actually a series of straight segments, and so the centre gap between outer 0.4&nbsp;mm walls will not be exactly 0.4&nbsp;mm all the way round, but is there any way to just force Cura to print three lines all the way round? 

Now, I know that this will print OK, but the corners will obviously look messier than they need to, and this is not the first time I've come across this problem. I'd like to get this fixed.

I have found a similar question, but it's for an older version of Cura, and the recommended solution of 100&nbsp;% infill doesn't help.
Even though each path, in theory, is concentric around the center point of the arc, the pathing does not always work out that way - especially around corners and radii. 

While your 1.2mm walls should always allow for three 0.4mm paths, if the slicer rounds down the overall thickness to 1.19mm, it will not detect enough room for three 0.4mm paths - but three 0.39mm paths should still fit, even if the slicer determines the thinnest part to be 1.17 mm.