BIGTREETECH 257MM*257MM Double-Sided Spring Steel Sheet For Bambu Lab X1/P1P Product Description: The BIGTREETECH Double-Sided spring steel sheet features three layers, combining a central spring steel core with surrounding materials seamlessly fused for optimal performance. What's the difference between PEI, PEO, and PET build plates? PEI surface. Characteristics: PEI is a high-performance, heat-resistant polymer known for its excellent mechanical properties and resistance to chemicals. It…