Printer bed support

This is for use with SonnyLowe's Y mod for the Folger Tech 2020 Prusa i3, which you can find here: http://www.thingiverse.com/thing:1278055

I am using this plate on top of the openbuilds Y gantry plate to add some rigidity to the rather soft folger tech aluminum plate. In spite of the added thickness, the 2080 rail mod lowers the print bed slightly, so no overall print height is lost. This plate adds enough clearance to allow the full 200mm range of movement even if the rail is only as lon