(Made permanent) Ball Bearing Ender 3 Spool Holder

I enjoy a lot the bearings that scarpantes has designed (https://www.thingiverse.com/thing:3019490), but they have to be removed each time from the spool to be put onto a new spool, and are not easy to be kept on the new spool while inserting it on the spool holder.

So I made this "add-on" to be able to make all of this easier, allowing to easily remove the spool while letting the bearings on the spool holder, and make it easier to insert the new spool.

The 2 files :
- original20180817_ba