Anet A2 40mm Fan Mount

thingiverse

Simple little fan mount for dual 40mm fans: one for the extruder and one for the hotend itself. Both versions, one and two, work really well and fit perfectly. The mounting holes are only 3.2mm in diameter, so you may need to drill them out a bit depending on your printer's tolerances. I printed mine out of PLA without changing the orientation or adding supports, with 20% infill, and it came out nearly perfect. You will likely need to cool the part while it's printing because the high angles cause plastic sagging, resulting in holes in the "duct". Since this fan mount is close to the hotend, you should probably use either PETG or ABS, both of which have better heat tolerances.