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Aluminum Extrusion End Cap (for 20x20) - pack of 10 : ID 1156 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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150mm T Slot 20x20 Aluminum Extrusion European Standard Silver Extruded Aluminum Anodized Linear Rail High Strength Guide Frame for 3D Printer Parts and CNC DIY Workbench(4 PCS,5.9 Inches): Amazon.com: Industrial & Scientific
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1/2 PCS 20x20 Aluminum Profile 2020 T Slot 6mm CNC European Standard Aluminums Extrusion Profile Free Cut Extrusion Sliver Guide - AliExpress
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250mm T Slot 20x20 Aluminum Extrusion European Standard Silver Extruded Aluminum Anodized Linear Rail High Strength Guide Frame for 3D Printer Parts and CNC DIY Workbench(4 PCS 9.85Inch): Amazon.com: Industrial & Scientific
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