Kossel Mini Geared Stepper Extruder Mount

This is a new mount for the geared stepper motor extruder used on the kossel and kossel mini.

The original design used a small piece and a few zip-ties to attach the extruder to one of the uprights. I didn't want to add extra stress to the uprights and I didn't like the idea of having it fastened with zip-ties (I also forgot to do this when I first assembled the printer, so I would have to de-tension the belts and take some pieces apart to put the necessary nuts in the open beam).

My solu