70mm electric ducted fan housing

This printed part

plus a 70mm fan like this one:
http://www.hobbyking.com/hobbyking/store/__29287__DPS_Series_70mm_EDF_10_Blade_Replacement_Impeller.html

plus a motor like this one:
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=18541

plus a shaft adapter like this one:
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=28380

equal a low cost edf unit like this one:
http://youtu.be/sk74hzTnlg4

Support material will help to keep the motor mount flat.

You need to drill your own motor mounting holes too.

This edf unit is used in my electric football design. http://www.thingiverse.com/thing:191442