In my ongoing effort to undersand what's happening, I stuck a print under the stereomicroscope. Layer height comes in at 374 microns, pretty sweet given that I sliced it at 0.37mm.
Comments and suggestions are welcome.
The print is a Greg's Accessible Extruder with ABS through a 0.5mm nozzle at 230C.
I'll throw a print in the SEM when I get a chance and post pics. Always fun...