Kossel Hotend Mount

This is a replacement for the Hotend mount based on the design by paul_delta:
https://www.thingiverse.com/thing:1123295

I thickened the base and added holes for the hex nuts so I don't have to fiddle so much when working on the hotend.

Added a fan shroud to further direct the airflow

I'm waiting on a replacement part for my printer so I can print this.