Hello Luca, you can see on our website that every extruder of certain diameter has two types, which are corresponding with two kinds of filaments:1.75mm and 3mm. Now you are using the extruder for 1.75mm filament, and if you want to change to 3mm filament you have to change all the parts on the extruder except for motors. So you are advised to buy a new extruder for 3mm.
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