Super simple mount for an E3D hotend and blower fan. I usually design my parts around brass inserts but decided to make this one work without any necessary inserts so that it could be more easily utilized. M3 screws in the 2.8mm holes seems to tighten down good, but mileage may vary depending on material used.
Some supports are needed on the back mount for the lip, but they're quite minimal. No supports are necessary for the fan duct. I added small angles in the upper corners to aid in bridging.