High precision PTFE tube. We supply 3 different diameters. Here is a quick guide on how to choose the right one:
For 2.85 & 3.0 mm filament the 3.18/6.4 mm tube with larger wall thickness and smaller inside diameter will allow shorter retracts due to smaller hyesteresis. The perfect choise for your Ultimaker and other bowden printers that use 2.85 mm filament.
PTFE tube 4/6 mm (inside/outside) diameters, for 3.0 mm filament.
PTFE tube 2/4 mm (inside/outside) diameters, for 1.75 mm filament.