I needed something to attach a coffee scoop to the mason jar I used to store the coffee in. This simple clip has a hole for holding the scoop, but it should be easy to replace that with anything else you might want to attach to the jar.

PLA alone is not enough to keep it in place, so it's attached with hot glue. Apply to inside of clip, then snap onto jar. The glue gives it enough resistance and is easily removable from both the glass and PLA.