PTFE Tube 3mm x 2mm (OD x ID) 6 inch Teflon Tubing Thermal Barrier for 3D Printer Hot End Heater Extruder in some MK8/MK9 Makerbot Clone 3D Printers - Walmart.com
3M™ 3D Printed PTFE Overview - YouTube
3D Printer 1M x PTFE Tube for 1.75mm Filament. ID 2mm OD 4mm – Printme
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Premium PTFE F4 Teflon Tube - 3D Printer Parts (20mm ID x 24mm OD) - MODDIY