About this 3D model

It's a hot summers day, I've got a motor from a busted cordless screwdriver, but no propeller.... all the ones i found were too small, or looked too hard to print, so when I saw this one i thought nice. After a quick hack it's now 11 cm wide, about 3 cm high and gives a gentle breeze. I added a height parameter to adjust shroud and centerpiece height Could be made even bigger but my yaxis is only 12cm, so maybe later :) Now i just need to print a stand for it! Edit, added a stand for a 28 mm dc motor, stls and freecad