I don’t use it. It’s pretty sharp and the PEI sheet is jut that; a sticker sheet. Works great and is easy enough to replace when it starts to get bubbly (with the amazing line up tool you can print) I use Nano for bed adhesion sometimes or nothing at all. I let the bed cool and the part comes off with no issues. Certainly not using that on a textured bed like the P1P. Those little scrapers you can print seem safer IMHO to use instead of that razor blade scraper. I think that was designed to aid getting the PEI sheet off anyway??