Alunar M508 Circular Fan Duct

thingiverse

I discovered that all circular fan ducts for the Anet A8 are angled or off-center from the fan output to the circular section. My Alunar M508 has a straight geometry between the cooling fan output and the heater block, so round Anet A8 ducts end up off-center on the heating block. Since TabLeft was kind enough to include a link to his Fusion 360 file, I could easily modify it to better fit the Alunar M508. Besides a straight and centered downward duct, I also moved the nozzle connector (where it meets the fan) inward by -4mm to center it on the heater block. Here is the modified Fusion 360 file: http://a360.co/2DIY8sp UPDATES: 2018-03-12: A shorter version was added (labeled "21mm"), as I had to adjust the geometry when I replaced the threaded throat on my hotend. It ended up being screwed into the extruder housing a little further. If you measure from the bottom of the 50mm fan to the tip and it's in the 21-24mm range, this one should work better for you. The original is for longer distances, depending on how far up you've screwed in the extruder/heatbreak threaded tube.