Updated Printrbot Simple Metal Feet

I noticed with my old design ( http://www.thingiverse.com/thing:426492) that the curved bottom edges of the printrbot simple metal were causing the feet to gradually slide towards the middle of the printer making it less stable and eliminating the point of the feet.
This design is made to eliminate that problem by having slots for both sheets of metal at a corner, making them practically immovable.
I hope you guys like it.
PS- This design also includes holes in the bottom for rubber pads