So I had a number of these extra Syma X8 motor housings (http://amzn.to/2l50c4k) laying around so I decided to design a 3D printable adapter to use them on a quad build project! You can also get the reciver here (http://amzn.to/2lgVFY3) to drive the motors and one very affordable quad with your 3D Printer! Also be sure to check out our web site http://Video-Drone.DIY3Dtech.com for more info on this project and many other!
Note 03/12/2017 - I have uploaded a new version (v2) of the design which allows for the use of M2 bolts and nuts to fasten the shaft housing instead of the Syma seft threading screws which tended to pull out. Have also modified the center hole so you can drill it out and use either an M2 or M3 bolt. Also you epoxy the shaft housing however if the the 3D housing breaks then you are a bit SOL and the reason for using the bolt and nut design.
Just clean up an fly its that easy!