my LR2 can’t go straight on the y-axis.
I ran into the same thing with the belt rubbing and made some clips to offset the belt:
You might also want to check if each wheel is parallel to the other wheel on the same side. There is a brace I made above to adjust them parallel since the plate seems to flex under load. I eventually also had to route a groove for the wheels to run in so the carriage doesn’t migrate over to one side of the table.
I am not understanding how or why your belts are rubbing? Using my belt holders? Can you get some pictures of them and maybe the Y stepper assembly.
I already use your clips.
but using a clip, the belt will look like a ‘W’
This is the only picture I have right now.
In regard to the belts touching the z tubes: An obvious question is are you positive the sides are straight and without any bow? And are both sides parallel to each other?
What sized idlers did you use?
Are the M5 nuts hitting the top, flip them over if they are.
I use 20t idlers(diameter is 12.3 mm.) and M5 nut doesn’t hit the top.