<div>With UM ² when changing filament, switch off the machine and make the extrusion by hand. </div><div><br></div><div>I propose another solution. Printed a small square of 1cm side with a tunnel in the center. </div><div><br></div><div>At startup, there is the old filament. And then, as and to the extent, changes color and becomes clean.</div>
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