MK4 heatbreak fan duct

Following the discussion here,

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

the heatbreak fan might be causing issues due to airflow around the model.

Since the influence on the Input Shaper by adding weight to the x-axis is not clear, I decided to design it as lightweight as possible, ending up with a calculated weight of 2.21g PETG.

Wall thickness is 0.87mm, following the recommendation of PrusaSlicer for thin walls with 2 lines at 0.15mm layer height. 

The design can simply be snaped onto the heatbreak fan, no need to touch any of the screws!

PrusaSlicer Settings:

Part is printed with front edge down, 3mm brim is used to increase the contact area with the printbed.

Plater

Supports: Everywhere
Brim: yes

Print Settings

Profile: 0.15mm QUALITY @MK4 0.4 with:

• Skirt and brim / Brim width: 3mm
• Support material / Generate support material: yes
• Support material / Syle: Grid

Filament Settings

Prusament PETG

Printer Settings

Original Prusa MK4 0.4 nozzle  (no IS for max quality)

Setup:

Material: Prusament PETG

Printedbed: Textured powder-coated sheet

Remark: The satin powder-coated sheet may require different brim settings for best result - see JMAC's comment below.

May be you are also interested in my model for the exhaust side - https://www.printables.com/de/model/876968-mk4-heatbreak-exhaust-duct - guiding the airflow up: