Bottom support brackets for Monoprice Maker Select/Wanhao Duplicator i3 v2.1

This is a modification of the bottom brackets found in http://www.thingiverse.com/thing:1685857

My version of the Duplicator has three bolts on the lower end but the 3d model only had two bolt holes. Print out 2 of each file to have support at all four corners. They will require M3x10mm bolts to attach to the printer as the stock ones are too short.