How strong can I reasonably expect a thin wall to be?

[airscapes]

Quality abs is very strong and rigid. I print abs all the time, within an enclosure heated to 50C. I just printed caps to cover 1/4" threaded rod ends that have 2 .4mm walls and they are very strong. I have never printed abs over 235C and my bed is normally 110C I also have made larger boxes with PETG and a .75mm nozzle (.8mm single walls) that are very robust . I also tap threads in abs parts with no issues, do it all the time.
Things that need to be right are initial Z offset (starting height) as the hotter the bed the more it will change so make sure you verify it is correct. Drop temp to 235C as well
Tiny cap is ABS other parts are PETG with .75 nozzle