I'm not sure what's happening here. My first inclination is that something is wrong with the filament. It is 3-5 years old and has not been sealed. It's my last roll of ABS.
In a nutshell, the laminations do not adhere. It will print solid perimeters. Eventually one of them cracks apart and curls upward. I'm showing two different pieces with this post. One is still being printed. The other two are from a finished usable part made on the same printer about 2-3 years ago. Quite possibly the same filament that I'm using today but I have no way to verify.
Aside from filament, the only major change to the printer has been re-arranging the electronics to fit in a new enclosure. I suppose it's possible that EMI is messing with my thermocouple readouts and maybe the temperature is reading higher than it really is. I bumped it from 225 to 230 and did not see an improvement though. I also tried tweaking the extrusion to put down slightly more material.
I'm getting the same layer separation every time I try to print. Is it possible for filament age to cause something like this?