MK3 RHD Fan Duct Rev. C

thingiverse

Nozzle Support Updated to Rev. C The Nozzle support has been revised to fit the existing screw length to the fan exactly as desired. Update of MK3_Nozzle_RHD Revision C Includes Several Key Adjustments. A more even air flow distribution between right and left sides is now a reality thanks to internal geometry changes that reduce stringing in the air ducts significantly. The front air ducts in the nozzle have been enlarged for improved airflow. A notch has been added to the collar of the air nozzle for the fan's "joint bump" to sit comfortably. The front part of the nozzle has been reinforced to minimize heat defects on the left front of the nozzle. Heat defects on the front left part of the nozzle can be caused by either heat radiation from the open cable end of the heat cartridge or warm air sucked up by the extruder fan and past the tip of the nozzle. This defect is also found on Prusa's R3 nozzle, but with a different design, it becomes slightly smaller. I believe the air nozzle of the Prusa MK3 can be improved, and this revision is my contribution to that effort. The front of Prusa's original nozzle R3 blows air forward downward and at the side of the extruder nozzle. To cool down the extruded filament quickly, I think the air should blow more towards the tip of the extruder nozzle. A flow simulation program called Autodesk CFD was used to construct such a nozzle. The program calculates air flow through the nozzle and graphically reproduces it in various ways.