Duct for 4" AC fan

A popular 4" desk fan (brand Polar Wind) is a very cheap way to move a lot of air in a small package. This printed object adapts it to 120mm computer fan sized ducting.

Gadget

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Description

Disassemble the fan to get down to just the motor and the blades. Retain the long self tapping screws that held the motor to the plastic frame.  Use them to attach the motor to the object as shown in the photos.

The SCAD could be modified to fit other fan types, it's fairly parametric.

The top bit is a bit more overhang than normally would print cleanly, but it doesn't bother me. If it does bother you, you might use support, or change the SCAD to reduce the overhang area a bit by increasing the height of the mount plates (this will increase the amount of plastic used when printing).

Materials and methods

4" desk fan, Polar Winds or equivalent, as shown in the photos
Printed object

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Bae1b78dfd7cedac050c4a3cbd822eea?default=blank&size=40Mint Catfish added this to the instruments collection ago
Bf80d14a7a0bfb961673eac01321b195?default=blank&size=40kjskls226 added this to the future makes collection ago
9e9f7b586c47c5c88b0abc134983a517?default=blank&size=40Jason Stokes added this to the Hardware collection ago
Mini mikeHCS-II added this to the Printrbot collection ago
Bc9fed96f5931c06dc35f5c7c632f93d?default=blank&size=40Cuthalion added this to the to print collection ago
Mini photoJohn Ridley published this design ago