Teinturman 's spool holder

I thought that a great spool holder should have the following properties :

- Easy to build
- Minimal Filament use for building
- No bearings or other parts than prints ( as it is not needed for such use !)
- Low frictions in rotation
- Nice design
- The filament spool can be removed and changed with a different colour easily .
- Can cope with multiple spool types in width, and in spool holes
- Can stand without being screwed
- Can be screwed on a wood platform
- There must be some