Made these to support spools with the FABtotum since the spools I have are bigger than the FAB filament enclosure. these can work with any spools of any size since they are connected with a rod (in my case I used an aluminum rod that I picked from IJEA as is section), the bearings are the same as what is used for roller blade wheels, I chose this size since it is easier to pick up for me. the diameter of the rod connecting the two pieces is designed to be 9mm Update Feb,17th, 2015: Added the free CAD source file to the uploaded filesthis made of pieces, you need to print 2 spool holders that will fit against each other and 1 support to assemble this, double that number for two supports as in the picture. for the connecting rod anything with a 9 mm diameter would work. the bearings are the size used for roller saktes' wheels (608zz bearings) so it should be pretty much available from any sports supplies shop