Been doing a bit of carton design at work using a piece of software called desktopcad by arden software.(not the most advanced)
Now on software like artios and prinect i imagine it works out the crash lock for you, you just have to type in the dimensions.
what is the maths behind working it out? Sometimes it can take like 10 attempts to get it right at work, and if you don't have a 3d preview to try making it up the only alternative is to cut it out on our zund and try it. I wondered if there was any books or references on how it was worked out before software took over.