Only items required in addition to the printed prints are a pair of long rubberbands.
Each clip and hanger should fit tightly on a 2x1 wooden board.
I wanted this spool holder to have the filament be perpendicular to the shelf as I felt that with the spools being pararrel there will be some awkward tension or any form of additional stress as the filament is traveling down towards the printers. The "adjustable suspended" thing comes from the use of the rubberbands. The rubberbands serve two main purposes. They act as main points of adjustments for the position of the holder relative to the shelf and as "tension relievers" so that most of the stress will be absorbed by the rubberbands rather than the fixed printed parts held on the shelf.
Included are two "options" for the support arms in terms of their length depending on how far forward the printers are to the shelf. Option A being the shorter one of the two. There is also the 1 inch diameter rod; The rod is there as a optional part as the original plan was to a dowel rod to save on the material cost. The option is there for those who can't find a suitable dowel rod. Recommend printing the rod horizontally for added strength.
*EDIT 8/17/18 - I had just included a modiflied version of the bottom support clip and also included a alternate version of said clip. The modiflied version (NEWER VERSION - BOTTOM SUPPORT CLIP) shaves off some of the materials of the original version and the thin part in the center now makes it easier to attach or remove from the support arm since you can pinch one end and it flexs open the other end. The alternate version (ALTERNATE VERSION - EXTENDED/OFFSETTED SUPPORT CLIP) is designed as the name suggests. It extends the support arms outwards so that it would not likely collide with any spools that happen to be behind the clips.
Post-process may be required.
Part of the 3DPN Design Challenge