I wanted a simple model that didn't require anything but the orignal hardware so I could move the spool off the top of my CR10S Pro. 

Uses the original t-nuts and bolts but there's no reason you couldn't use suitable hardware if you had it. Holds a standard 1.75mm 1 kilo spool.

I know this will work with the Ender 3 Pro & the CR10S Pro V1 as the spool holder is identical on them. I see no reason why it shouldn't also work on any other Creality machine with the same style of holder. I've provided the STEP file for you to modify if you wish. The rib in the middle is just my engineer brain saying make sure it's strong enough, you could probably remove that and just carry the slot right through the part.

I printed this in PLA with 3 permiters at 0.24mm on a 0.40 nozzle, 10% infill and it's more than stable enough for my needs.