I tried print V3 all together. My printer normally prints moving parts quite well. I could not get it to work. I did use supports "from build plate only". Things I noticed: the shaft in the small gears does not extend far enough to engage in the holes that you have left for the shafts.
Also if you made the base of the ring a little deeper then you wouldn't need supports under the big ring. (Make the design so it rests on the outside ring, not the small gear) That would also be a big plus.