incomplete fill, 'funny' layering artifacts

[frankpirz]

New to S3D, used slic3r over a year.
I've got a set of parts that are giving me odd problems and I don't know what to tinker with to fix it.
I started getting top layer voids when I used rectilinear infill. [they are small, look closely at the pix]

rectilinear infill

So I tried concentric infill (the parts are cylinders, so I figured it would work 'better').
If anything, it was worse! When I went to concentric, I increased the number of top layers from 3 to 4.

concentric infill

I'm printing at .2mm layer height for better definition on the small details on the parts.

There's one part that's printed 'inverted' because of the step on it's larger surface.
It's about a 45 degree constant angle on the underside. When I turn the part over I'm finding that
most of the slope prints fine, then for no apparent reason the slope gets ragged which really
looks bad.

inverted part

any thoughts on how to fix these problems?
apparently 3 attachments is the max, I'll follow this post with the factory files.

Frank Pirz
Media Conversions LLC

[frankpirz]

factory files

[JoeJ]

It looks like the infill isn't bonding well enough to the outline perimeters. This is usually due to not having enough of an overlap between these two features to solidify the bond, or perhaps because the solid infill is being printed too fast.

I would suggest increasing your outline overlap percentage to 25-30% (Infill tab) and also decreasing your solid infill underspeed to 70% (Other tab). That will help make a stronger bond and print the outermost surfaces a little slower to improve the quality.

It is also very possible that some of these problems could be to to inadequate support from below (meaning that the top surfaces don't have enough of a solid surface below it to print on. You could also improve that by increasing your top solid layers to 4 (Layer tab) and potentially also increasing your infill percentage by 5%. But I would do the 2 recommended changes above first before trying these things.

[jimc]

in addition to what joe said another thing that causes this is too high a print temp. lower by 5 deg at a time. something you need to look at as well is the condition of the infill. if the infill looks broken and hasnt printed clean it will cause the top layers to also be bad and take way more layers than necessary to straighten out. if your infill looks broken or printing messing then increase the infill extrusion width. bump it up to 140-150%. this is basically an infill extrusion multiplier. it will extrude more filament in the infill so you will be printing a more solid infill grid.