my settings:
O2 Export= 1:1000
O2 Import= 1:10
In max i use "inch" units,but you can use mm or cm too,if i'm not wrong.
With "meters" it's too small and impossible for me to work with this setting.
This is my first attempt and to be honest i'm lost with O2 for the moment,hope someone could confirm if this settings are good or no.