Twotrees Flexible Magnetic 3D Printer Heated Bed Cover - 310x310mm Removable Build Surface for CR-10/CR-10S | Perfect for Smooth Printing & Easy Model Removal

The issue with this PEI spring sheet is the adhesive. Its terrible. I used it once for printing ASA and everywhere I printed is bubbling and pulling up.In comparison, Fulament product has equally thin PEI layer and comparable steel sheet; but last far longer before beginning to bubble. I had that sheet for about 6mo before it bubbled up and became unusable. The Two Trees’ sheet didn’t even last a single print.The issue here is the adhesive layer that bonds PEI to the steel. Two Trees appears to be using a weak hard adhesive that causes cracking and peeling. These sheets are typically bonded with a gelatinous like VHB style adhesive. This is unfortunate, as this product could be a good cost effective replacement to some premium alternatives.