There should be some rating on borrowers. I am very careful who I lend things to. Many of my friends are careless. It's not in particular with your stuff, they are like that. This is a consequence of decades of disposable consumer product culture.

This is a great idea. I bet some kind of point system for careful use would encourage folks to use caution.

> Libraries have survived damaged books just fine for millennia

Libraries don't rent thousands dollars equipment that can be misused and broken. Moreover, it is much easier to fix a book than a damaged CNC vise.

Instead of renting out several thousand-dollar pieces of equipment, Instead they rent thousands of several-dollars pieces of equipment.