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Slotted Aluminum Extrusion - 20mm x 20mm - 610mm long : ID 1221 : $7.50 : Adafruit Industries, Unique & fun DIY electronics and kits
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Amazon.com: 400mm ZYLtech Black 2020 (20mmx20mm) T Slot Aluminum Extrusion for 3D Printer and CNC (Single Pack) : Industrial & Scientific
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Adjustable Angle Support for 2020 Aluminum Extrusion : ID 1257 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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