Our Original Prusa XL and MMU3 have a great feature called Spool Join. 🦾 This feature automatically switches to a new spool when the current one runs out during printing. It's ideal for using up partially empty spools, but you can also start large, uninterrupted prints: load up to five 2kg spools, enable Spool Join, and let the printer create a massive 10kg model without any user intervention. ✨ | Prusa Research 3D printers