What is "Crafting Bonus on items is now capped at 60% on Official Servers" and how do I get that bonus?

[Ankhwearer 19]

The most recent bug fixes included the line:

"Crafting Bonus on items is now capped at 60% on Official Servers"

What is this crafting bonus they speak of? How do you get it? What does it do?

[Alaister 6]

https://atlas.gamepedia.com/Crafting_Bonus

[UnknownSystemError 111]

The higher your intelligence stat, the greater chance you get for a bonus to the crafts you make using blueprints. Mine is a little over 400 now without really trying and I get anywhere from 0% to 15% extra stats on a craft. The reason they nerfed it was people who had exploited to level 150 and were using dupe mechanics to boost their intelligence to around 3-4k and getting rolls of around 300%.