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Amazon.com: PATIKIL FR4 Double Side Copper Clad Laminate PCB, 2 Pack 100 x 70 x 0.8mm Copper Plated Universal Prototype Circuit Board : Industrial & Scientific
Amazon.com: Premium G10/FR4 Garolite Build Surface for 3D Printing - High Durability, Self-Releasing, Compatible with Ender + CR10S - Available in 1.5/2mm Thickness, 310x310mm & 235x235mm (2mm x 310mm x 310mm) :