Hotspot Fan Holder
by theron, published
This is a collaboration with Tim Pool http://timcast.com and Geoff Shively twitter.com/Jiraffa. They use 3G hotspots for live video streaming and they often overheat and stop working, so they wanted some way to cool the hotspot.
So we sat down and designed this thing in less than an hour and printed it out for testing the next day. Rapid prototyping FTW!
This thing is a holder which allows you to attach a standard 80mm computer fan to the hotspot for cooling.
The prototype has been used covering both the Republican and Democratic national conventions during the heat of summer and seems to work pretty well.
A few notes:
The grid on the bottom doesn't need to be so tight, and only serves to block airflow. My next revision will make fewer larger holes. The grid doesn't actually need to be there at all unless you need to protect the hotspot from foreign objects.
The smaller holes in the middle of each side were intended for a setscrew to hold the hotspot in place, but I don't think they're necessary. You can hold it all together with tape or rubber bands.
Most everything is adjustable in the OpenSCAD file, but has not been tested for extreme values.
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Print with support.
Insert hotspot. This was designed for the AT&T Elevate 4G hotspot - http://www.att.com/shop/wireless/devices/sierrawireless/att-mobile-hotspot-elevate-4g-aircard-754s-black.html The model may need adjustments to accomodate other hotspots.
Attach a standard 80mm fan (Radio Shack 273-243 was used - http://www.radioshack.com/product/index.jsp?productId=2102826 - but any computer fan should work). Attach with M3 or similar bolts.
Fan should output air away from the holder (drawing air from the other side, increasing airflow over hotspot.
Power with 12v battery (Energizer Xpal 1800 was used, with connector added for the hotspot and fan).
Two side slots will be used for the hotspot. One side slot is open for connectors (power, antenna, etc). The other side slot is just for symmetry and flexibility and can be taped over or left open.