Bottom Frame Corners for Modified C-Bot

Bottom corner piece mod for C-Bot. The extrusions fit in the corners, making them incredibly rigid. I have also included some versions with the sides open to make it easier to mod an existing C-Bot.

Check out my [Parametric V-Slot Corner Bracket](http://www.thingiverse.com/thing:1543523) if you need to make any changes.

These *should* print without supports, but add them if you need them.