Prusa Mini+ CFD-optimized Fan Duct v2

Updates:

01.02.2023

• improved airflow path for normal version
   

24.01.2023

• Pinda probe was contacting fan duct→ bigger indentation in fan duct
• optimized airflow

23.01.2023

• added new model for better flow with low placed printingnozzles and silicon sock

01.2023

• removed material to avoid collision with z-carriage
• already first successfull makes → see comment section

Testing is still required regarding:

• collision with heatbed screws
• collision with heatbed cover
• silicon sock fit and airflow (does silicon sock block airflow)
• bridging test
• printability of the model (air splitters, overhangs, duct openings)

Testing is welcome! I will try to include any feedback.

Version 2.0 Improvements

• Improved alignment of side fan ducts for more accurate nozzle targeting

• Further reduction in air resistance through the fan duct (→faster exit speed, same volumetric flow as Prusas original design)
• No more collisions with heatbed cover or centering screws at the back of the heatbed
• More precise CFD analysis and optimized outlet alignment
• Additional room made for silicon sock (cannot guarantee results as no silicon sock available for testing)
• Surface imperfections from previous model retouched (but also some new “impferfections” added to make sure everything fits^^)

Version 1.0:

Upgraded Prusa Mini Fan Duct

• Two additional nozzles to cool the component from three sides
• Optimized for minimal air resistance while maintaining the same volumetric flow as the original nozzle (similar load for the fan)
• No additional support structures or modifications to other components needed (PINDA, Heatbedcover)
• Nozzle designed to avoid overlap with other parts (Siliconsock, Heatbedcover, Heatbed screws, Pinda holder)
• Material with higher glass transition temperature recommended to prevent melting of fan duct ends

(ideal) Printing Parameters

• Layerheight: ≤0.2mm
• Linewidth: 0.45mm
• minimum feature size (cura): 0.07 mm → for optimal air splitter bridging
• Material: PETG, ASA, ABS, other higher temperature materials
• There are important bridges (air splitting), ideally use Arachne for ideal wedge form of the splitters and slower bridging speed.
• Do not print with more then 20% infill (else too stiff and too high pressure on linear bearings)

Written using ChatGPT^^