<https://community.ultimaker.com/topic/9159-what-fans-to-install-on-umo/#comment-104225>
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"Well I have not uploaded the fan anyware because isn't finished. I had to put some blue tape because it 'shakes' with the aluminium. But I can show you the 'beta' of it \nI used scissors to save the inner aluminium 'not needed for the mod at all' but I wanted to reuse the left side and be able to change it for a shorter version If I use e3d nozzles. The right side get's the grip from two m3 nylon nuts. \nUmm I can't link the photo from the iphone. Check my gallery. I'll link it when I reach the computer \n \nThe specs of the fans, I don't remember. I just got what they had on the store, they have ball bearings and they are 24V 50x50x10 I think. They don't come 'on' until the led power reachs 150-160. But at 255 they do push a nice amount of air, so much that my first fan versions where cooling the bed and I had some pla issues. The design isn't finished yet, but so far the overhangs are much better. \nEdit: My fans are 50x50x15, that's why I had to scissor the left aluminum... Anyhow the air it's ok, now I need to finish the design to make it more stable and make the airflow cover the area that the nozzle prints, I think I'll try to use the two holes that are on the lower aluminum to make a good grip and because the aluminum don't go over 40-50C it should be ok as long as the fan's are on... I think  \n  "
<https://community.ultimaker.com/topic/9159-what-fans-to-install-on-umo/?tab=comments#comment-103299>