Ultimaker Original Dual Extrusion

The Ultimaker Original Dual Extrusion is an FDM 3D printer from Ultimaker B.V. with a 210 x 210 x 205 mm build volume.

Calibration

• Start with a dual-extrusion inventory check before touching calibration

Action: Confirm that both nozzle assemblies are physically present, seated correctly, and free of visible carbonized residue, stringing, or bent PTFE/filament paths. Inspect belts, pulleys, and the print bed surface, then power on the machine and move each axis through a short manual travel sequence if your firmware or controller allows it.

Common defects

• Ooze and stringing during tool changes: The most characteristic dual-extrusion defect is filament leakage from the idle nozzle during swaps, which can leave wisps, blobs, or spider-web strands on the print.

Symptoms: Fine strings between towers, blobs on outer walls, or a visible scar at every tool switch.

Causes: Melt pressure in the inactive nozzle, insufficient retraction, overly hot standby temperature, or travel paths that pass too close to the part.