Customizable Z-Clip
This is a simple customizable clip you can print that can have many uses.
There are a few other similar objects I found on thingiverse but none were quite the right size so I made a customizable one!
It can hang over a cupboard door or kitchen drawer to hang a garbage bag, It can be a coat hook, it can hold a bag on your baby change table for dirty nappies (that's why it was invented!), etc...