I made a bean cooler to go with my Arduino-controlled popper. Compared to what has been posted on the forum by others, e.g. DIY Bean Cooler, it is compact and easy to store.
I used a 120mm PC case fan (with green LED for dramatic effect!) and 3d-printed the housing. Here is the final product switched on.
Because the way 3d printers work, the housing was split into two parts. 4 bolts and nuts were used to secure them with the fan.
Close-up shot of the drazzling green light
My popper takes 120g green beans and ends up with 100g roasted. The housing takes a 180mm sieve which can accommodate a lot more than 100g of beans.
1 x 120mm PC case fan, $8
4 x bolts and nuts
1 x 12V power adapter (re-used)
3D printing material, $2
I have no doubt it will work well to my need (100g). Can't wait to test it on the next roast day!
Possible next steps: maybe change to a 5V USB fan, because who doesn't have 1 or 2 too many USB power chargers
Awesome idea! Would love to hear how fast it cools.
Great work, love the LED fan.
"does it come in other colours" -- Diana Fisher
After I got the fan I chose ($8) at the local computer store, I asked for the cheapest fan they had. The guy gave me a look, pulled a box under the desk and found me a fan without package. The receipt showed it was $5 and was marked as **OEM**. It was obviously used but in as-new condition. I assume it was taken from a returned custom built PC. Surprisingly it was one of the higher end case fan that came with RGB LEDs and a 4-pin connector. After checking out the datasheet, it turned out to be not as hard as I initially thought. They took 5V and 10mA for each LED. So I didn't even need any LED drivers - just an Arduino UNO did the job.