And as Tom's 3D noted, yeah there is a lot of air that gets kicked out and forward once these are on the Hemera. So make sure you are using either the fan that came with the Hemera kit or buy this if you accidentally bought the wrong voltage of fan in the kit (like me). To the point, then these fans actually have some geometries meant to enhance this outward airflow tendency which synergizes very well with Hemera's heatsinks. This is something I realized only after attempting to use Noctua A4x20 fans. An optimized heatsink ensures airflow is diverted up. This hot end is a dual-drive system with a hardened stainless steel drive train. This is exactly what you DO NOT want when choosing a fan for the Hemera Heatsink which is designed to take advantage of normal fans' tendencies to blow air a bit sideways, away from the axis. Aside from the Duet, one of the biggest improvements that I made to my Ender 5 is the 24VDC version of the direct drive Hemera hot end, drive motor, and extruder combination by E3D. Noctua's marketing for their fans are all about how their airflows are more concentrated and straight - that is, the direction of air is more aligned to the axis of the fan. For reference: I have an Ender 3 with an SKR 1.3 using Marlin 2.x.
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