Raise3D N2 Part Fan Bracket

Remix of Anubis123's remix of Firesped's blower fan duct. I made the following changes:

- Split into two parts to minimize supports
- Strengthened the fan mount arms
- Removed the wall of the duct on the nozzle side, so more air gets pushed there. I found that the last version wasn't as direct as I wanted
- Tailored the extruder mount to slip into the extruder's front bolts

Required parts:

50mmx15mm blower fan
4x M3x16mm bolts
2x M4x16mm bolts

Print with ABS or other temp-resi