Cylinder head cooling fins not printing well

[rilewedge]

Any ideas on whats causing the overhangs not to print well?
The flat on the melted side (bottom photo) is the bottom attached to printer bed.

Material is ABS, Layer height set to 0.1mm bed is set to 90c, and hot end to 225c. Though I have seen it drop to below 217 while printing.

[Jimustanguitar]

Are you using support at all? The round shape of that part is definitely an overhang that would be difficult to print without.

[Polygonhell]

What sized nozzle?
At 0.1mm layers, the plastic s very stretched coming out of 0.5mm nozzle, to the point it often snaps when it's unsupported.
I'm not sure this is you issue, but it's easy to east to establish, just run the bottom part of the print at 0.2 layer height an see if it's any better.
I'd also check your actual temperature with a thermocouple.
That black stuff on the bottom is burnt ABS, usually it's just from plastic sitting on the nozzle but running too hot will also do it.

[rilewedge]

No, Not using support.
0.5mm nozzle, I have watched it print the bottom layer of the overhang seems to be pulled up by the Nozzle as it passes by.
The rest of the print is clean of any burns so I think its just areas where the ABS followed the nozzle.

I'll try printing it with a grid support

[rilewedge]

Better but started to "melt" again at the end of the supports.
Still trying to get that center plug out...

[rilewedge]

So I was able to get the outer rings to print cleanly by adding supports with the following settings:

Support type: Grid
Amount: All 90 degrees
Pattern Spacing: 3mm
Infill Angle: 0 degrees
interface Layers: 2
X and Y distance: 0.5mm
ZGap: 5 Layers

Is there another setting(s) that I could use to get supports up into the upper area?

The Support Everywhere box fills up the area but some of the supports are impossible to remove.