SK450 extended leg with rod hole and reinforced

This is a remix of the SK450 extended legs with a hole added for the two rods used as bumpers and for maintaining orientation.
Version 2 is a reinforced version to handle the stress I've seen cause breakage on my earlier model.
Version 3 elongates the leg a little bit and uses a rounded bottom.
3.5 thins the leg by 1mm to avoid the need for some sanding after printing. The added reinforcements more than compensate.
V4 is a little heavier but is intended to provide further reinforcement. There may be some mismeshed faces on this one.
V4 lite has slight thinner walls down the leg to compensate for the added weight from the reinforcements.