I bought a 50 shot a loooong time ago. I had filled a few thousand carts with it and I was getting real sick of I threading the thing and decided to design what I call the flavor saver. Jacketed tank, hooked to recirculating heater, couple npt fittings with a valve and a luer lock. Now I never have to unthread that dam barrel again.
The cost of everything was ~2000 because I needed a heater (1,200). Literally the day it all arrives, I find the cart farmer website and put my palm through my face. Not a huge deal, I can do 1000 carts per hour no sweat, but god damn it, it’s better and cheaper and I missed it. Probably will get one later because I can repurpose literally all the parts to other projects when the time comes.