Practical and fast. He can take part in the action at any time. Filament is inserted behind the principle of a clip. The sponge is cut from the hair rollers. Three sponge rollers pressed against each other. Filament can be pressed and removed at any time, in a second. You can also do this while printing.
100%, or standard infill and 3 perimeters (0,4 nozzle)
The devil may be colored (as in the photographs) when changing the color of the filament during printing. For a two-color version, the color change from a height of 19,6 mm.