How to tell the slicer to make fill transitions somewhere else?  

Silks are designed to expand a little and close gaps but in consequence the surface can be uneven; and, have you dried that filament?

If the cosmetic finish is important then sand, fill and paint.  Take care to hand sand at low speeds so the part does not overheat and distort.

Cheerio,

RE: How to tell the slicer to make fill transitions somewhere else?

You can try changing the infill angle in the slicer and you can try different top infill patterns.

It takes some experimenting and ‘you can’t always get what you want…’ as the song says. Sometimes the slicer just has a mind of its own.

Cheers

RE: How to tell the slicer to make fill transitions somewhere else?

Thanks for your proposals!
Unfortunately a post processing is not possible (increasing costs) and fill angle, pattern, extrusionwidth and velocity I tried out already. Is there maybe a way to enforce perimeters to split the model visually in two parts? Because then the slicer could create the top fill for each side in one go...

RE: How to tell the slicer to make fill transitions somewhere else?

I think you are asking for a smooth top layer - please try this setting in Prusa Slicer 

infill/ top fill pattern / concentric

the only other possibly I know of is top fill ironing

RE: How to tell the slicer to make fill transitions somewhere else?

Is there maybe a way to enforce perimeters to split the model visually in two parts?

You may be able to do that by using modifiers, depending on the geometry. See attached example

RE: How to tell the slicer to make fill transitions somewhere else?

Thanks to all for your hints!

1. Concentric makes symetric pattern but the surface is at the end points not really smooth

2. Ironing makes it smoother but the uniform reflection are lost 

3. If I split the objects in 2 modifiers (left, right) and use the same settings (e.g. 1 contour) the Prusa Slicer automatically remove all settings form the modifiers. It only works if the modifiers differs. I know this makes sense, but unfortunately not in my case. Is there maybe a way to switch this of? 

RE: How to tell the slicer to make fill transitions somewhere else?

Thanks, now it works, and the surface is smooth and has an even reflection on both sides because now the top fill for each side is printed in one go. The perimeters split the top layer of the object visually into two parts, but this looks nicer as the iregularities on the surface. In my case I use pattern monotonic, angle 0° and extrusion width for contours 0,45 (left) and 0,449mm (right). 

RE:

But one can also of course select only the extrusion width of the top fill (left 0.4, right 0.399) and you get a minimum optical transission. The result is much better than usual, especially with silks.

RE: How to tell the slicer to make fill transitions somewhere else?

Great to hear! Would love to see a picture of the final results

RE: How to tell the slicer to make fill transitions somewhere else?

Unfortunately I can't really catch the light reflection on the photo. But one can see the artificial seam in the middle (at the seam of the circles). Both side looks now evenly smooth without interruption.