Anti-warping air deflector for PRUSA i3 MK3S

thingiverse

The intake side of the hotend fan produces air turbulences. These cool down the workpiece and may cause warping, especially at the front left corner. With this three-part fan inlet the air comes from above. So air turbulences do no longer affect the workpiece. Deflector part 1 is bolted to the extruder with 3 x M3x10 and 1 x M3x14. Part 2, the hotend fan and part 1 are hold together with 4 x M3x18. Some screws are inside the funnel and you will need a 2,5mm ballpoint hex key. At my printer, the cable of the fan was long enough for the new mounting position. The air deflector does not collide with the z-axis. Setup your slicer for "detect thin walls". Layer height 0.2 or 0.3 mm. Print with PET-G or another material that can stand the heat. No support required. The design is inspired by https://www.thingiverse.com/thing:4380310 https://www.thingiverse.com/thing:3279826 https://www.thingiverse.com/thing:3001795 https://www.myminifactory.com/object/3d-print-25828 and others. My "propeller": https://cults3d.com/en/3d-model/tool/extruder-rotation-visualizer-for-prusa-i3-mk2-mk3-mk3s The deflector has been made for the original PRUSA i3 MK3S. I do not know, if it will also work with the MK3. **For me, this modification works. But there is a warning from Prusa, please read the summary, before you print: https://www.thingiverse.com/thing:3001795 Thanks to @Snow_Eagle for this hint!** * 09/01/2020: Warning added. * 08/24/2020: Protective grille added, new photos.