Paper Clip for Billy Bookcase Shelf

My practice area for guitar is in our living room, with the amp-modeller etc behind a baby gate to protect from an inquisitive toddler- which doesn't leave much space for a music stand. There is a Billy Bookcase though, so I designed these to be able to hang music down from the shelves whilst sat practicing. 

If anyone wants clips for different thickness shelves (these are designed for 19mm) let me know. 

It's a quick print (25 minutes on my X1C), printed without supports in the orientation the model loads in.