MK4 Hotend Fan Shield - eliminates turbulence / drafts at the nozzle caused by the hotend fan - Fan shroud - REMIX of the Remix -> V4

Final V4 slim design:

• Clip-on mounting Shroud
• No airflow restriction
• Easy on / off without removing screws
• No supports needed
• Smooth bottom
• outer 0.2 skirt for better bed adhesion 
• same angle as MK4 fan holder
• only 2.8g / light weight

For my warping tests this model was used:
https://www.printables.com/de/model/568748-asa-warping-test-for-mk4/files
in combination with my Extruder Fan Duct:
https://www.printables.com/de/model/692672-mk4-extruder-fan-duct-tweaked-version
Filament was extrudr ASA DuraPro (245 / 110 degrees)

→ Warping was reduced and dimension deviation was also lower

Installation:

Simply slip over the fan. 
Please push until the Fanduct Frame is flush with the fan housing.
(See also photos of other makes)

(Make sure you snap it all the way into place. It may seem like it's seated, but make sure it is all the way in. Mine made a nice click when it fully seated.)

Printed on a MK4 in PETG with 0.6 nozzle / 0.15 or 0.2 Quality / no supports

MK4 part cooling is inconsistent - this Shroud prevents this.

This Fan Shield / Cover has noticeable positive affect when printing materials and geometries that are sensitive to overcooling. 

Also this modification ensures that the hotend fan gets cooler air.

Description from Davids Original Design:
“When dialing in my MK4 printer to match the print quality of my Mk3S+'s, I noticed that the MK4 part cooling was inconsistent. Upon further examination, it became clear that the positioning of the MK4 hotend fan was creating turbulence/drafts at the nozzle and affecting part cooling. ”
 

Discussion in the PRUSA Forum:
https://forum.prusa3d.com/forum/english-forum-original-prusa-i3-mk4-general-discussion-announcements-and-releases/heatbreak-fan-might-be-causing-asa-abs-warping/

Also a neat design upgrade for your MK4 :-)

final version :-)