1. Upgrade your crafting ability “Mechanics” and “Workshop” fully to get all the benefits of this.
2. Head over to a vending machines with only 10€ on it.
3. Manually Save in front of it, mash the buttons and get as much soda as possible until it’s sold out.
4. Manually save again and load up the save, and the vending machine will not be sold out, and you can redo the process over and over.
5. After getting maybe 1000 cans or more. Disassemble them and collect the materials.
6. After this point either use the materials to upgrade your weapons and armor or sell the materials for an easy profit.
I recommend you abuse it before this exploit gets patched.