I'm (surprisingly) having a problem getting my PEI substrate to stick to the heated bed surface. The ABS item being printed stuck great to the PEI surface. I've not seen anyone else post on this problem, but perhaps someone has seen it.
Note, this is the PRINT SURFACE warping, not the item being printed. That part went great with no delamination even on a large flat bottom.
I'm using 3M 468 adhesive to attach a PEI plastic sheet directly to the heated surface of my Flashforge Creator Pro printer. The heated bed is anodized black and the adhesive is a sheet cut to the requisite 6" X 9". It seemed fine and looked pretty good with few air bubbles when first attached, but the first print caused the edges of the PEI plastic to warp up from the corners of the bed.
It appears that the weak link is that the PEI detached from the adhesive. While this was not uniform, removal of the PEI sheet showed that 95% of the adhesive was still attached to the print bed.
The PEI has one glossy side and one matte side, and I chose to apply the adhesive to the matte side to get the glossy surface. Does this make a difference?
I applied the adhesive to the PEI surface just as it was after removing the protective plastic coating. I figured this was a clean as it was ever going to get.
I'd definitely appreciate some ideas on this.