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Base/Enclosure for the Noctua NH-AAS desk fan by MajorHardware. It features power connector, power switch and weights to make it more stable.

Bill of materials:

PWM controlled 120mm 12V DC fan (standard computer case fan). Recommended Noctua NF-A12x25 PWM.
Noctua NA-FC1 4-Pin PWM Fan Controller.
Printed helix fan shroud from the original design https://www.thingiverse.com/thing:4911660 or the remix https://www.thingiverse.com/thing:4912018 (recommended)
Printed base top and bottom from this thing (two parts).
DC-099 5.5mm x 2.1mm DC Power Female Panel Mount Connector (e.g. https://www.amazon.com/dp/B07CTCZ3RM/)
DC 12V Power Adapter with 5.5mm x 2.1mm barrel connector (e.g. https://www.amazon.com/dp/B0998BMQYP/)
Mini Boat Rocker Switch (like this one: https://www.amazon.com/dp/B094FWYWL5/)
Standard 120mm fan guard (e.g. https://www.amazon.com/dp/B01H0P7OC4/)
16x 0.50inch steel bearing balls (for weighing the base). You could also use 12mm balls, they will be slightly loose but you can pad with pieces of foam or paper. A premium option would be to use tungsten putty instead.
1x M3x40mm SHCS
4x M3x35mm SHCS
4x M3x20mm SHCS
4x M3 washer
9x M3 hex nut
4-pin fan extension cable (only the male connector with wires is needed)

Some assembly notes:

The Noctua fan controller has weird shape and it's difficult to mount securely. There is a cutout for it in the base top and a \"pedestal\" underneath it in the base bottom. The fit is tight enough that I just used some double sided sticky tape to fix it to the bottom and it doesn't move.
For connecting the power to the Noctua fan controller I used a fan extension cable. The male connector goes to the controller input, the female connector is cut off. The ground wire goes directly to the power socket and the +12V wire goes to the socket via the rocker switch. Polarity at the socket depends on your DC adapter but most often the inner contact is +12V and outer is ground. The PWM and RPM signal wires are not used on the input side of the controller.
When mounting the power socket do not use the spring washer that comes with it. It won't fit and it's not needed.

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Enclosed base for the Noctua NH-AAS desk fan

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