This is a universal scalable filament spool holder. You can add as many of them as you need (minimum two).

For assembly you need: 

1. M4 screws 
2. M4 inserts 
3. M8 threaded rod
4. bearings for roller skates

The cylinders are made tight and need to be pushed into the holder.

The maximum width of the spool is around 84 mm.

My print settings:

• filament Prusament PLA Galaxy Silver and Prusament PLA Blend Lime Green
• layer height 0.3mm
• supports are not needed