Filament is fed into this tube so that it can be pulled through the 3D printer properly during the print job. The curved tube keeps filament from bending or kinking during operation, allowing easy feeding through the machine during your print job.
To load filament into the outer feed tube:
Place the filament spool on the top of the machine. When using loose filament that is not on a spool holder, first apply the included filament spool holder, then apply the filament to the spool holder
Feed the end of the filament through the eye located on top of the machine
Slide the end of the filament into either side of the tube until it has gone through and come out the other end