I did this design for a simple key holder for ease of print.

The reason I made it with separate hooks is so that the hooks can be printed on their side to make them stronger due to layer direction.

The hooks fit snugly into the little grooves and with a drop of superglue they stick quite well.

It sticks onto the wall with double sided tape but if there are any requests I can put some holes in for screws.

Also thought of changing the front of the back panel so that its completely closed in the front.