As the description says, this is a long cylinder with a hole down the middle made out of slippery bendyness. This is perfect for use as the filament feeder tube to the extruder, but not something to order to go between the extruder and the hotend... for that you want a 1.8 to 2.0mm Internal Diameter.
I bought this because it's PTFE, the ID is 3mm, OD is 4mm, and it 's black. I am happy to confirm these four things correctly and fully describe this tube.
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