Like most people who own any of the Ender series printers, the side spool mount doesn’t really work well. It would constantly get jammed/tangled, preventing the filament from feeding. I was tempted to print the mount for the top but the top of my desk prevents that from being an option, so I went a different route.
If you have a spare lazy susan or record player/turntable laying around that’s not being used, place the spool on top of it (horizontally) and let it go.
Now if this has already been said/recommended before, I apologize, I just felt the need to share.