Karo - Ender 3 cooling fan duct

Can't print a lattice cube? Ring coolers don't help much? Too lazy to print a Bullseye or Hero duct?

The Karo cooling fan duct was designed with the following considerations:

• I want to actually be able to print a 3x3 lattice cube without the print being destroyed due to edges bending up
• I really don't want to remount BL Touch because recalibrating that is just extra work
• Try to make it crash into glass clips a bit less (more Y clearance)
• Print in one piece
• No supports 

Finished lattice photos are (relative to the cooler) from the side and from behind.

Notes

After installing, make sure the cooler fan does not collide with the duct. If it does, take a knife to the pointy bit and cut off the leading edge a bit.

(V1) (The air wedge might be completely useless for all I know. Though I do know for a fact that some of the air is being blown away from the fan. I haven't done any fluid simulations of the sort. Reading a paper titled "An optimal design algorithm for centrifugal fans: Theoretical and experimental studies" would probably have helped if I thought to look it up ahead of time.)

It's named Karo because the skirt is sorta like a diamond shape, but naming it "Diamond" would probably be overestimating its performance.

Lattice cube in photos: https://www.thingiverse.com/thing:1804350 (3x3x3 Lattice cube v4)

Changelog

v1 - 2019-03-03 - Initial release
v2 - 2019-04-20 - Adds notch for improved ambient cooling, changes volute tongue angle to 90° (appears to improve air flow but increases noise slightly)

Print Settings

Printer Brand:

Creality

Printer: 

Ender 3

Rafts:

No

Supports: 

No

Resolution:

0.2

Infill: 

20

Filament:
Any PLA (or the hottest you use) 
 

Notes: 

No need for fancy settings. 0.2 mm layer height, 2 walls, 20% infill should work fine.

Category: 3D Printer Parts