Handle for Ultimaker Extruder-gear

I did not understand what the hole of the extruder gear is for, so I tought that it is a hole for a handle or something like that.
I found out what it is for, but I tought that a handle would still be nice.

I am not really good at 3D-Modelling, but I did my best and created a handle for the Ultimaker Extruder-gear. It works very well and I am really happy with the result, even tough it doesn't make sense to have a handle, to be honest. But it looks nice :)

All you need is a printer with