Flsun Fan Duct - 270 degrees.

Update Apr 21: The duct wasn't aligned well for my FLSun i3 hotend, so I shifted the fan connection to the left a few mm, and while I was at it, opened up the airway from the fan to the circular part, and added some internal flow directors to better balance the air output.

A caution: The fan end probably needs supports but if you auto-generate supports make sure to delete any that appear around the duct outputs, or you'll have a hard time getting them out post print. I used a 2mm drill bit t