Report as inappropriate

I've just printed 90% of the parts, now I've started assembling it and noticed the rollers are too lose. If i push the pipes to the bottom bearings, there is 1mm space between pipe and upper bearings.
Checked my pipes OD: 25,02mm OK
Checked 608zz OD: 22.00mm OK
Printed parts seem to be ok because the corners fit perfectly.
Any idea on what could be the problem?

Also, congratulations for such amazing and beautiful desing.