??? Forging in Maker

I read on the MSEA forums that it allows you to forge any classes' equips, but you have to know the recipe beforehand (you can't just select it from the dropdown menu).

Don't know if it's true or not but there's no harm in testing it out.

I was about to determine myself to test it when I found out that most of the stuff shares the materials needed.

Either it's random, or doesn't work.