Cable holder for extruder motor

It is a support for the cables coming from the extruder in the Rep Rap Prusa I3.
This sample has been made with PLA but I think is better to use ABS in this case.
The initial idea was to insert an spring in the top of the holder and I tried to print it but it was difficult to print and the result was not good.
I will better try with a metal spring but by the moment it is working without it.
I appreciate the modifications made by my collegue Roberto F.