Gear Repairing
As an avid player of survival games, I am a big fan of being allowed to repair my gear and tools if they have durability. The loop of constantly having to gather the items to remake tools or having multiples of the same tools in my bag was frustrating.
My initial pitch was to have a crafting station that would refill the durability of your things. To keep the system simple, repairing a tool above 50% durability would cost about 50% of the materials required to craft. If the required materials cannot be divided by 2, then the repair costs would need to be adjusted. An even simpler solution would be to only require one type of material (the most important one in the recipe) to repair. Here is an example of crafting costs: