Mega I3 Filament Sensor and Extruder Fan Bracket

This combines and replaces the already existing Filament Sensor Bracket of the Anycubic Mega I3 with a 40mm Fan Bracket to cool the Extruder.
I designed this because with some PLA Filaments I had the issue, that the extruder gear got hot enough, that the filament started to bend before going into the bowden tube.
I reused the magnet of the old Filament Sensor Holder which fits and sits nicely in this design.

The holes for the Fan are designed to be barely tight enough for 3mm wood screws t