Qidi X-pro Manual -

Retraction Settings: For dual extrusion, "Ooze Shields" or "Prime Towers" are essential. These features clean the idle nozzle before it starts printing, preventing "stringing" or color contamination on your model. Maintenance and Troubleshooting

The X-Pro arrives nearly ready to use, though some critical assembly and removal of shipping materials are required. qidi x-pro manual