True, I didn't think about the bearings.
I think I will just print one of the rollers at 101.6% and check.
It's not that much difference though. Im comparing sizes now:
A 3mm hole ends up being of 3.048mm.
The space for a bearing to fit is 7mm and scaled up 7,112mm.
If everything turns out ok I will post the results.
Thanks for the help.
PS: I don't want to confuse people with this tests. Allted let me know if you want me to delete this comments.