A hook to restrain the movement of Bowden tube and cable on Ultimaker 2.

UPDATE:
Version 3 features adjustable position for the hook. It also allows the tube to move in Y axis to reduce unnecessary bending. The length is slightly shorter than the spool holder.

Past versions:
Version 1 and version 2 has different position of the hook. 1 goes more to the left, and 2 goes more to the right.
Both v1 and v2 restrain the tube to the edge of the printer, which would create extra bending while the printhead reset to home position.

Ultimaker

Ultimaker 2

0.4*0.2

20%