It's a securitron unit from Fallout 3: New Vegas. The original model was filled with holes and required a lot of support so I filled it, removed any parts that wouldn't print well (i.e wires and flat meshes) and cut it in half to reduce the amount of support material.

There still is some visible holes at the bottom of each side of the model but (at least within cura) the sliced view shows that the holes are filled in with material.