Noctua Fan and BL-Touch Combo Shroud for Ender 3 Pro
thingiverse
This is a combo shroud that allows you to mount both a Noctua NF-A4x20 FLX 40mm fan and a BL-Touch auto-leveler to your Ender 3 Pro. You will need four M3 screws (approximately 1.5 cm in length) and nuts in order to secure the fan to the shroud. NOTE: The Noctua NF-A4X20 FLX is a 12-volt fan, while the Ender 3 Pro is a 24-volt system. If you wish to upgrade to the Noctua fan, you'll need to install a voltage regulator (aka buck converter) in-line with the fan in order to step the voltage down from 24 volts to 12 volts. I personally suggest the Valefod LM2596.
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