This is a sturdy spool holder to secure 1 Kg rolls of filament. It has an M6 hole on the main roller so that common hardware can be used to secure a spool instead of a weaker plastic part, it can also be bolted to a surface with M6 bolts if you so choose. The model will need supports due to the overhang in the middle of each side but it can be done without to save filament and still give a good result. ABS filament was used for this model as it had better properties than PLA, as such I would urge you to use ABS or PETG filaments or a stronger material to ensure longevity of your spool holder.  Enjoy printing!