T Hex Bit Driver / Holder

I made this model as i was getting really frustrated with all the Hex bit holders i was printing off from other peoples models. Most were too tight so i tried scaling them but could never get them to be that nice balance between tight enough for limited bit movement but loose enough that a small magnet in the bottom would suck the bit down and i could still easily remove the bit. I finally realized it was because all the models were sized by replicating metal bit holders but everybody failed to