RC Blocked Diff - V3 - Nylon printed bushing

Same as here - http://www.thingiverse.com/thing:1734496 - , but with nylon printed bearings. It's pretty hard so source small diameter precision rods (5 mm diameter used in my design) and also matching bearings. My bearings did not fit the rods, I had to grind the rods quite a lot to make them fit. So I thought I could give a try to nylon printed bushings.