This is a project inspired by the BedJet system. Designed to circulate air under a blanket to combat heat buildup when sleeping. However, this design can be used in other scenarios as well where air flow from a stationary fan needs to be re-directable.

The provided 3D models are designed to fit a 10-inch Axial fan paired with a 10-inch diameter air duct. Though, the models can be scaled down or up to fit a different setup. The fan and the air duct are the only truly required parts.

Optional components include a remote outlet switch so that you can turn it on and off from the comfort of your bed, or, even better, a smart home outlet so that you can use a voice command to control it. Depending on the type of fan you buy, a motor speed controller may also be useful so that you can decrease/increase its speed. Some fans come with one included, but if not, then your fan may be stuck at top speed without an additional motor controller.

The provided photos demonstrates how the 3D printed pieces fit with the rest of the components. The photos include the fan_base.stl which holds the Fan vertically, the fan_to_airduct_adapter.stl which connects the fan to the air duct (must be printed 4 times and glued together), the mouthpiece.stl which directs the airflow at the other end of the air duct (may need to be split to fit your print bed then glued back together after printing), and the mouthpiece_blanket_clip.stl which can be glued onto the mouthpiece in whichever orientation works best for your setup (it provides a clamp for the corner of a blanket to slide into which can help hold it down and keep the mouthpiece under the blanket).

Not demonstrated is the mouthpiece_adapter.stl which can redirect the airflow of the mouthpiece by 90 degrees, this may be required depending on how your mattress is setup. Also not shown is the mattress_hook.stl which provides a hook that you can tie/strap the mouthpiece to so that the mouthpiece stays in place depending again on your mattress setup.

Printed in PLA, the print settings I use are, 10% rectilinear infill for the fan_base.stl, fan_to_airduct_adapter.stl, mouthpiece.stl, and mouthpiece_adapter.stl. For the mouthpiece_blanket.clip.stl I use 30% gyroid infill because its a part that requires a bit of flex. For the mattress_hook.stl I use 30% rectilinear infill because it needs to be sturdy enough to resist flexing when holding/securing the mouthpiece to your bed.

The specific hardware that I've used for this project are:
1x GARDTEC CAB706, AC 120v 10-inch axial fan
1x 10-inch air duct
1x Additional power cord cable
1x AC motor speed control dimmer

However, depending on your comfort level with soldering/wiring, you may prefer an AC motor speed control dimmer that is a little easier to use out of the box, the one I elected to buy is a little janky and requires additional work to use. There are solutions that are just an outlet that you can plug your fan into, but they may cost more. Additionally, if you bought a DC fan instead of an AC fan, you will need a DC fan controller instead.