Here we have a small but very helpful Gadget, a filament spool holder that can be srewed into walls etc.
You can use it for various different spools and can store up to 2 stadard spools of up to 70-72mm of width
The holder has a little closing ring in order to prevent your filament from slipping off the holder.
Have fun printing and feel free to leave comments on improvements or suggestions on a V2 :D