This is a remix of the part that connects to the bed from http://www.thingiverse.com/thing:1459160
I printed the part included in that link and found that the screw hole in the bed was too far in to the bed for the part. I modified the part to give it a bit more clearance. This was necessary for my Monoprice Maker Select (Wanhao i3 2.1 clone). Go to the link above to get the other necessary parts (chain links and base plate).
Monoprice Maker Select 2.1
I printed this in ABS, since I wanted it to be able to handle the high heat. My bridging wasn't doing so well, so I printed it with supports for the opening that grabs the bed.
I modified the original part in TinkerCAD.