As the title suggests, my LR2’s Y-axis wanders. It seems like the whole thing shifts left until the right side z-rods touch the side of the table.
Based on my search on this forum the easiest solution is to add some Y-rollers (which I am printing now).
Does anyone has a better suggestion? Please let me know.
Thanks
LP
I think some people made guiderails before, but the LR2 was before my active time here. 
Dunno about better…
I never got to actually doing it, but did have similar issues with my LR2. It wasn’t very bad, maybe a mm or so, but the Z rails would rub against one table edge after enough passes back and forth.
Jeffeb3 used rails to constrain the X motion of the wheels on the LR2, and I was going to do rhe same. I had planned to rip some plywood rails that would go alongside the wheels, one beside each pair to keep them in line.
This happened to a few people, but many never did have the problem. It was speculated that a slight warp in the Y plates might cause this. I think it could also be a printer calibration issue too, where the axes aren’t perfectly square. (Probably not in my case, I bought the printed plastic from the V1 store, and Ryan is good with making sure his printers are in top shape.)
Anyway, the rails did fix the issue for several people.
Adding a rail to both sides helped me a lot!
The best and final fix was my upgrade ro the lr3 
I root caused the reason my Y axis was wandering. Putting it in here in case it will help someone else.
My table was not level. The skate wheels on the side that was a bit higher up was moving in just because of gravity. I deliberately made the other side higher and the Y-axis started wandering in the opposite direction. I am still going to put on those Y-rollers but my plan is to put them on only one side and have that side a little bit higher elevation (which is what it is now by accident but if I move it I will make sure to do that on purpose). That will constrain that side of the Y-axis and the other side just rides along.
Initially, I just shortened the x-rods so that the z-rods were touching the table, and just slid against it. This fixed the wandering but introduced friction and was a terrible solution. Eventually I attached one side of the Y to a linear rail and this completely fixed the wandering and the friction - this is essentially what the LR3 does too so it might be worth upgrading as the LR3 fixes many of the other quirks as well.
There are some pics of my LR2 Y-plates attaching to the linear rail in this thread
I though of that solution as well but it is a bit more involved so I left is for future improvements. As of now one side of my Y-axis is constrained by being forced to glide on the skate wheels and the bearings. Seems to be working fine for now.