So here's a new one (for me anyway). Last night I modeled and printed my own version of the 'Nest' from BlueLounge: http://www.bluelounge.com/products/nest/. There was one area of the print that had issues I haven't seen before. On the flat interior "tray" area, where it meets the inside vertical walls, I got these odd looking gaps in the print. In the center of the tray it looks fine. But at the base of those walls it looks mighty sketchy. Finished late so I didn't take a picture, but I'll be able to take and upload one after work today if people need to see it.
But for now, based on my description, any ideas what a common cause might be? Largely default settings, but extruding at 180 instead of 190. Have gotten good results with these setting and this filament before.