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3 = 3.0mm, #1 = 1.75mm. Let's choose the size you want. Overview: - This dual extruder is specially designed as an essential accessory for 3D printer. - Fits for Ultimaker 2, Ultimaker 2 Go and Ultimaker 2 extended 3D Printer. - Nozzle is made of alloy, durable and stable. - Aluminum part: Through Oxidation, looks very beautiful - Very Long Screws are made of carbon steel, super solid. Specifications: - Fits for 1.75/3.0mm filament (optional) - Nozzles: 0.4mm - Material: Aluminum Alloy - Application: 3D Printer Package Included: 1 x 1.75/3mm Dual Heads Extruder Kit