I replaced my PEI with BuildTak a few days ago, using the same removal and cleanup technique listed as if I was going to use new PEI. However, ABS sticks REALLY well to the stuff, and I found that using the following settings helped make parts removable, yet still stick very well during the print job.
In Cura, change to Expert mode. On the Start/End-GCode tab, I added the following two lines to the very end of the start.gcode section:
G1 Z0.03 ; move to 0.03 mm (e.g. 30 microns) above Z=0
G92 Z0 ; set the current position to Z=0
It’s been working like a dream - no curling up of corners, yet parts pop off easily without snapping pieces off of them.
I thought I’d share this to help anyone else who thought about using BuildTak.