biqu h2 40mm part cooling fan duct

thingiverse

compact part cooling fan duct for the biqu h2 extruder. for 40mm fans so you could use the original ender hot end hardware, even the screws. this is the first version though so i might update if it doesn't perform good enough. printed with the fan side on the bed, tree support and a 20 line brim because of the small bed contact patch. took 2 hours. Update 1, 29.07.21 after testing the first version i wasn't satisfied with the aim and strength of the airflow, so i made a new version with bigger cross sections, better aim and the cavity is split from the start. now it got a bit bigger but also a lot more efficient. Update 2, 07.09.2021 version 3 is basically version 2 but the air nozzles are smaller again to direct the air in a faster and more accurate stream. I shifted the nozzles a bit forward to compensate the curve. now running the 4020 Noctua NF-A4x20 FLX (12v) version 3.1 only has a shorter top mount boom to fit with my remixed h2 linear rail mount.