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To avoid such color contamination, so-called ooze shields or prime towers are available.
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You can print two identical and not too large objects simultaneously, but the distance between the nozzles must be larger than their dimensions.You can use different nozzle diameters for different areas of the object (reduction of printing time).to make composites or use inferior or soluble filament as support material for complex shapes) without changing the material. You can use two different materials (e.g.You can use two different colors without changing the material.Best Dual Extruder 3D Printers: Comparison, List & Guide Advantages and Disadvantages of Dual Extrusion