PTFE tube (4mm outer diameter and diameter 2mm inner diameter)
Instructions
No supports are needed
I decreased thickness (0.2mm) of the layer below the magnets for stronger connection. Make sure you use 0.1mm layer thickness for the first layer (or use included .gcode).
Insert 8x2 magnet (or 2x 8x1 magnets) in each hole when printer stops to change filament. Keep an eye on the magnets polarity
Replace the original screw in the filament sensor by M3x20 screw. Use sleeve to effectively increase its head by 2.5mm