Neptune 3 - Fan Duct 40mm axial fans

Parts Needed:
For the Fan Duct:

• 3 x 40x20 axial fans (I used: Sunon Maglev ha40201v4-000c-c99)
• 2 x LM2596 DC-DC Buck Converter Step Down Module
• 12 x M3 nuts
• 8 x 25mm M3 screws
• 4 x 30mm M3 screws

For the Optional LM2596 Support:

• 2 x M3 nuts
• 2 x 8mm M3 screws

(Note: The LM2596 Support is optional. Alternatively, the LM2596 module can be placed in the mainboard area.)

Wiring Instructions:

• Mainboard Fan 1 (24v) → LM2596 n°1 → Hot end fan
• Mainboard Fan 2 (24v) → LM2596 n°2 → Part cooling fans (The LM2596 n°2 module,  placed in the LM2596 Support, is positioned on the printer's side.)

User Tip:
In your slicer settings, set the part cooling fan speed to 100%. This enables you to use the LM2596 to adjust the voltage, giving you control over the fan's speed.

Reposition the limit switch cover as shown in the photo; while functional, it's not the best solution. I might post an update later on — feel free to make your own improvements.

This fan duct is a part of the "Elegoo Neptune 3 Silent Mod" collection.