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https://www.real3dprinter.com/3d-printer-parts/1-8-mm-id-ptfe-teflon-tube-for-1-75-mm-filament-reprap-diy-3d-printer-parts-4-5-piece/
1.8 mm ID PTFE Teflon Tube for 1.75 mm Filament RepRap-DIY 3D Printer Parts - 4.5' Piece