Coming from Ender 3 S1, I liked the mounting of the spool. I decided to recreate this on my Ender 3 V3 SE and KE printers.

This will be using existing spool bracket, but allows to be clipped on the frame instead of screwed on. 

This model does not contain holes and will have to be added manually. 

Can be mirrored to mount the other side.

I added additional bolt and nut on the side for extra support.