Here is a simple ESC mount I created for my quadcopter build shown here:

http://backyardrc.wordpress.com/2013/07/23/quadcopter-build-goes-3d/

Designed for 1/2 inch square dowels and most ECS between 20-40 amps fit the mount. I used Turnigy's Multistar 30 Amp Multi-rotor Brushless ESC found on HobbyKing's site:

http://www.hobbyking.com/hobbyking/store/__25365__Turnigy_Multistar_30_Amp_Multi_rotor_Brushless_ESC_2_4S.html

Checkout the full build over at http://backyardrc.wordpress.com/

https://backyardrc.wordpress.com/2013/08/13/3d-printed-quad-build/

Want one of your own ESC mounts printed for you? Or another design on thingiverse?? Contract my printer with 3D Hubs and I'll print, pack, and ship you your part within a few days!!

Check it out: http://www.3dhubs.com/harrisburg/hubs/mark

And checkout the complete series of BackyardRC's Quadcopter parts on Thingiverse:

Center Hub: http://www.thingiverse.com/thing:136209
ESC Mount: http://www.thingiverse.com/thing:122363
Motor Mount: http://www.thingiverse.com/thing:128477
Quadcopter Leg: http://www.thingiverse.com/thing:136208
Ardupilot top plate: http://www.thingiverse.com/thing:136213