I just Designed and 3D printed this apple watch band. What other tools should I add before I get it printed in metal?

I want to know what the most used tools are that I could add to my personal multitool project. I have two more spots available and obviously cant add everything like pliers but what does everyone use the most? I was thinking tweezers? (right now I have a small knife/box opener, bottle opener/flat head, and a file/larger flathead)