Ok so I've pretty much done the game legally so now I wanna mess around and finish a few loose ends, and in doing so I really need some damn caps.

It seems after the vendor glitch being patched there's no other way. I've heard about the brotherhood glitch but I'm not with them and honest Dans quest but that's not available after the end game which is where I'm at and don't wanna go back as I'm way ahead now with my progress after the main story.

Has anyone got any infinite caps advice or even suggestions?

I was not aware that they fixed that in the patch

http://www.gamesas.com/topic/1570128-fallout-4-game-updates/

Yeah they been pretty crafty as it's patched out and now everything I buy from the vendor in diamond city is actually REVERSED on me so anything I sell him goes to him but doesn't register in caps for me so I lose out big time.

I play on the PC, so I do not know of any tricks that would give you unlimited caps.

Probably the best thing to do is to earn caps legally by building a water purification farm. I initially started doing that a Starlight Drive. I began with simply putting in 6 water pumps near the workbench that would generate anywhere between 9 - 14 purified water per day. Then I installed a large generator and two industrial water purifiers (40 purified water each). I generally get between 60 - 75 purified water per day. I surround them with a wall just in case... but Starlight Drive was never attacked. I have since started to build up the settlement and have 9 settlers there.

Scrap the radioactive barrels to get rid of the radiation.

Based on my charisma (8 ??) and charisma boosting clothes I can sell each water for 16 caps. That means every time I visit Starlight Drive there is 960 to 1200 caps worth of water to sell. Note, water does not automatically accumulate over the days. Water production stops when the game places water in the workbench. You must remove it before any more water is generated.

You have played the game legally? I don't understand it. Sorry can't give you any tips for how to get caps except for working for it. Make drugs, sell them I hear is lucrative.

As someone already mention, purified water can make you more money than anything in the game could, and less work, too.

Better than water is jet, low cost to make..1 fertilizer, 1 plastic. Sells for 35+ depending on your chrisma. Low weight, .1 to water .5. And you don't have to built a high defense to make up for the increase water production.

Put in A LOT of water purifiers and sell them. Make a lot of drugs and sell them. Cook everything and sell it. Oh! And plant plenty of mellons and gourds and sell 'em. They have no other use as far as I can tell.

There are plenty of non-exploitation ways to make oodles of caps.