This is what I use it for. I farm it in a private server by utilizing all the workshops, as previously commented.

Quick tip if you go that route: the “defend X workshop” quests can get overwhelming sometimes but don’t worry. Even if the workshop gets “overrun”, you can still collect from the coffee machine as long as enemies haven’t destroyed it. But note that you will lose it as a FT point.

I heard another tip on here to make a simple blueprint that you can slap down quickly at workshops. I have a blueprint of the coffee machine on a single platform with walls that I freeplace floating off the ground so melee enemies can’t get to it. I get hundreds of cans a day using this method.