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A one-meter length of PTFE tubing with a 2mm inner diameter and 4mm outer diameter, sized for 1.75mm filament in Bowden-style 3D printers. PTFE's low friction lets filament slide smoothly, which is why it is the standard liner for Bowden setups and also serves as hotend liner on many printers. It is a consumable: replace it when the tube is kinked, scorched or worn, and cut it square so the ends seat cleanly in the couplers. Compared with generic tubing, the key checks are the 2mm ID and 4mm OD, which match common pneumatic fittings and 1.75mm hotends.
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This is a 1 m length of PTFE tubing for replacing a 3D printer's Bowden tube that is damaged or worn. It has very little friction, so 1.75mm filament can feed smoothly.
The tube has a 4mm outer diameter and a 2mm inner diameter. Check the tube size your printer requires before replacing the old one. Make a square, clean cut when fitting the new tube.
