Force concentric to match the desired shape

[nixxon]

Hi folks,

I'm wondering how to influence the outer layer 'concentric' to force this to be as round as possible. For instance if I try to print a very simple round disc and chose concentric for top and bottom layers it fills the object very neat (even and round like a snail). However, if I add holes to this disc the outer layers aren't nicely 'concentric' anymore. It looks like a puzzle of concentric infills.

Here is what I'm trying to achieve:

neat.png (108.26 KiB) Viewed 1417 times

This is what I get as soon as I add more shape/some holes to the very same object:

I once achieved to have a beautiful round 'concentric' top layer for the same object I just made these pictures (I still have the gcode, the printed 3D model and the appropriate blender3D file), but I can't reproduce this anymore.

So, what's the trick here? What am I doing wrong at Simplify3D?

Thanks
Nixxon

[kabali16]

this is how S3D generates concentric infill at present. What you are seeing with other features on the top is that it is still producing concentric fill but not in a single circular pattern anymore, rather into multiple segments of concentric fills.