Filament spool

Yes, another filament spool !

Advantages of this design are :
- Large 100mm center preventing filament cracking and de-forming
- It is 195mm in diameter. Hold easy 1 kg filament. Also (just) will fit most 3D printer beds.
- Filament lock holes for both start and end of filament.
- Large shaft center of 32mm fitting most 3d printer spool holders.
- No other parts needed, except 2x m4 screws.
- Little material as possible to speed up printing and reduce cost.

Lot of other