Not the best at CAD, but this makes it very easy to tighten the belts and align them to the idlers (somewhat…). Feel free to make it better ;)
Both fans use the 40mm stock fans.
Print the carriage with supports in the orientation the files in. The other parts shouldn't need supports.
I knew that the fan could be better so I found this fang fan blower and shroud. I didn't design it. Say thank you to Kookaburra88. I printed this at .32mm layer height, supports from the base, and 8mm brim on the anet a8.
Best print orientation is the way the file is. Only use support for x carriage and fang shroud.