I have been trying a lot of filament mounting systems. I was unable to find something that required minimal printing and can be done quickly and at scale. Each set can easily hold up to 5 x 1KG spools. Fully extendible and modular system. 

Printing Recommendation:

Please use at least 3 walls for all printed parts for durability. PLA works just fine, it is what I used. But if you have more durable material, it is recommended.

Materials Required for a full set

1. 2 Pcs of Mount plates (3x2 multiboard base plate)
2. 4 Pcs Screw in mount snaps for multiboard
3. 1 Pcs of spacer multiboard element (helps to properly space out mount plates)
4. 2 Pcs of Mount brackets preferably layer lines going perpendicular to the mount snap direction
5. 8 Pcs of Dry Wall Screws, link is for the ones I used. But as long as they are rated for weight bearing, you should be fine. Choose at your own risk.
6. 3/4th inch wooden dowels of your choice. I got mine from local walmart

Installation (Outside in)

1. Press in 2 screw snaps in top and bottom row of each of the 3x2 multi board base plate
2. Press in the weight bearing snap in the first or second column of the second row in the base plate
3. Add spacer to separate the plates
4. Press in the spool bracket into the load bearing snap into each of the base plates
5. Side in the dowel into the slotted holes
6. Mark level lines on the wall
7. Screw in the contraption. Into a stud (recommended) for additional strength. Ofcourse, use appropriate screws if driving into a stud
8. Remove Spacer
9. Leave 14-16 inches of gap until next set of brackets are installed. Choose your distance here according to the mounting screws for safety.

PS: You can also install the base plate horizontally for easy screw hole accessibility if using power tools to drive your screws into the wall.