Handle anti-scratch lock

Before I printed the Buffer I read the comments, which are mostly enthusiastic, but some note that they're afraid of filament scratching at the handle. I was not afraid of scratching, but thought that filament could clamp between handles and divider.

So here's my simple addition, which clicks on the handle. You can add it to your original print. no need to change anything else. I first printed it in PLA, but was to clattery and brittle. so I switched to PETG (my whole buffer is PETG, no clue why I chosen PLA - maybe of small and fizzy parts print easier in PLA) Now I#M really happy with this - enjoy.