Automated filament exchange method of 3d printer

An automated filament exchange method wherein an automated filament exchange device is adopted, the device having a filament winding subspace formed at one side of a filament winding main space on a separate spool (202) for winding a second filament for a 3D printer, a spool (201) attached to one side of the filament winding subspace so that the subspace is located between the spool (201) and the separate spool (202), and a connection portion (210) adapted to connect the start end of the second filament wound on the separate spool (202) and the finishing end of a first filament for the 3D printer wound on the spool (201) so that after the second filament wound on the separate spool (202) is all consumed, the first filament wound on the spool (201) is continuously consumed through the connection portion (210), the method comprising:

• the spool location step of locating the spool (201) for winding the first filament for the 3D printer;
• the subspace first filament winding step of winding the first filament on the subspace of the spool (201) located at the spool location step;
• the first filament location step of allowing the first filament wound at the subspace first filament winding step to pass through a gap formed on the main space flange located between the main space and the subspace and locating the first filament at the main space of the spool (201);
• the main space first filament winding step of winding the first filament located at the main space of the spool (201) on the main space of the spool (201), wherein after the first filament is wound on the subspace of the spool (201), the first filament passes through the gap and is then wound multi-layeredly on the main space of the spool (201);
• the separate spool location step of locating the separate spool (202) for winding the second filament for the 3D printer;
• the subspace second filament winding step of winding the second filament on a subspace of the separate spool (202) located at the separate spool location step in the state where the start end thereof is left, so that the start end of the second filament and the finishing end of the first filament are connected to each other;
• the second filament location step of allowing the second filament wound at the subspace second filament winding step to pass through a gap formed on a main space flange located between a main space and the subspace of the separate spool (202) and locating the second filament at the main space of the separate spool (202);
• the main space second filament winding step of winding the second filament located at the main space of the separate spool (202) on the main space of the separate spool (202);
• and
• the connection step of connecting the finishing end of the first filament wound on the main space of the spool (201) and the start end of the second filament wound on the subspace of the separate spool (202),
• wherein the second filament is unwound from the main space of the separate spool (202) and is then unwound from the subspace of the separate spool (202) through the gap formed on the main space flange, and as the start end of the second filament is connected to the finishing end of the first filament, the first filament is continuously unwound from the main space of the spool (201) along the connection portion (210) connecting the start end of the second filament and the finishing end of the first filament and is then unwound from the subspace of the spool (201).