[CR6-SE] blower fan duct 40x20mm

Updated:V8 - Ditched the light hole, and removed all grill slots. Very lean and mean looking. Use supports only touching build-plate. Support angle 90 degrees. Update: V7 - Per many requests I made a square hole in the front for a 40x20 hotend cooling fan Update: V6 - Per many requests I made the cooling slots much wider resulting in a stronger and better printing performance. I also made it less deep for a 40x10mm fan only with my adapter. Update: V5 - rather than require bridging mode and sacrificial layer, I made the fan recess into a slot opening from back. If interested, download and print V5.stl and ignore the need to use bridging. This is a fan duct for Creality CR-6 SE that uses a 40x20mm blower fan to supply filament cooling to the hotend. Lots of good airflow. I think it may also fit the MAX. Print with front facing down and with supports only touching buildplate. .8mm wall thickness, brim, and use the Cura option for bridging as I have used a sacrificial laye