Hi, I choose to make one of this spool "stand" cause it's easy to make, using ball-bearings, and it offers a constant tension on filamment! The probleme was that spools are all differents, and even ball-bearings exist in different sizes. Here you will be able to customize the spool stand with your ball-bearings diameter and width, and of course with your spool diameter and width. In order to not create one stand by spool, i design an adjustable jigsaw part.

Here the provided STL files are perfect for roller ball-bearings and for 200mm diameter spools of 40 and 70mm width.

Edit 28/04/2016: You can create your own bearing spacers here.