Limit Switch Filament Run Out Sensor

I saw a bunch of limit switches cases out there, but none for the ones i had, so i designed one based around it.

The switch i have is close to maker bots version here

http://www.thingiverse.com/thing:4971

It worked on 2 out of 3 of my switches and the other one i had to bend the wheel around to get it to work so if you are having issues it might be that.

Also the filament is designed to only work one way, the cords should be hanging out the top, because thats where i have my pi moun