Under-Bedsheet Fan Extender!
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Have a fan right under your blanket, for a fraction of the price of an Eight Sleep!
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- Creative Commons — Attribution
Under-Bedsheet Fan Extender!

Ever since I moved into my new room, I have always had issues with heat while sleeping. In the Toronto area, we have really cold summers and really hot winters! It can get as cold as -35ºC, and as hot as 40ºC! In the summer, I find it really difficult to sleep due to heat.
This problem is usually solved by having a tower fan. However, I don't actually own one! Therefore, I have to prop my honeywell fan on my desk, and get the perfect angle so I can cool down. However, it is still really annoying. This is why I meade the under-bedsheet fan extender!
The under-desk fan extender is able to mount directly on my honeywell fan (Or any fan, for that matter, that is =< 197mm) and create a customizable path for the air to flow right between my bedsheets.
Part specifications

Base
The base is the part that connects to the top of the fan. The base is around 250mm tall. It is meant to be put on a 197mm diameter fan.

Extender
The extender is a part that is able to create "Fine adjustments" to the height, so that way your fan extender is perfectly aligned. It increases height by 70mm, and can be stacked for the best adjustment.

Turning part
The turning part is in the name: It rotates the airflow by 90º so that way it can point to the bedsheet.

Fan output
The fan output is the part that goes under your bedsheet. It will create that "Cold breeze".
Assembly!
If you want to make your own under-bedsheet fan extender, there is no offical instructions, as it really depends on the height of your bed, and your specific needs. However, you are going to need to have the following:
Item | Quantity |
|---|---|
3D Printed parts | However many of each part you need |
Typically around 6 for every connection between two parts |
To make parts connect, you are going to attach parts using the following:
Each part has a max of 4 "joints". These parts are exactly 7.5mm from the edge, so you can use connectors. The process goes as the following:

Attach connector_1.step and connector_2.step as seen in the image for each of the joints

Add the screws - This makes sure that the connection stays intact.
You must do this for each of the joints.