Spool holders for the FLSUN V400 pillars/extrusions inspired by OlleMark's model. 3 of these can be used per printer or only 2 is needed if you use the spool holder that comes with the machine. Having these are very handy if you constantly change filament for different models or for a bit of storage space. They use the M5x6mm button screws that attach the top plates of the pillars (2 per spool holder). The model comes in 5 parts per spool holder in 3 files with parts 1 and 2 to be glued together. As the print gets screwed to the printer it is very secure and stable.