Quote Originally Posted by threedee View Post
Right side is completely unsupported. The only things holding in "in position" are one plastic wheel pulled by gravity and drive belt. I can lift the gantry off the "rail" by 5mm.
The engineering issues there are the poor rail and bearings and the belts not being synchronised properly, the plastic wheel is a good engineering solution if the rest were adequate.
I think you should get someone to look at this for you as you are considering changes which, at best, may not help whilst not addressing the primary issues.