This is a 3D printed 5015 type blower/fan that is suitable for Prusa i3 or any other type of printer.
I used a spare fan (Multicomp MC36257 with sleeve as bearing) that I had laying aroung and modified it to use it with these 3D printed parts.
Included are 3 types of blades: radial, reverse and forward oriented that you can test and use whichever you like most.
Also included are Solidwork files that you can change and model yourself. Original credits for these files go to Alexandr Ivanov who posted them on GrabCAD.
Please give him a like on his page:
Video of working 3D printed fan:
Please share with me your remixes so that I can also adapt new and better designs.
Thank you and happy printing :)
I found it best if I use forward facing blades and the settings like in the picture below.
STL v2 file also added for you to download.
UPDATE (26.6.2018): added a remixed bottom part from user Aurion55