nema17 cable tie anchor

I designed this for my printrbot smalls so I could zip tie my wires to the back of the Y motor to reduce strain on the motor and endstop wires and tidy things up, but it seems like a thing others might find useful with the prevalence of nema17 motors in hobby 3d printers.

You will need longer screws which I assume depends on your motor length, I replaced the 2 top 32mm screws in my motor with some 40mm ones I had handy.