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During 3D printing, the nozzle needs to move continuously. When the nozzle moves to next point through the open space, it might ooze melted plastic and then solidify and stick to printed parts. That's 3D printer stringing.  1. Retraction Solution: Set the retraction distance Note: The most important setting for retraction is the retraction distance, which determines how much filament will be pulled back from the nozzle. Generally speaking, the more filaments are pulled back from the nozzle, the less likely it is to sag when the nozzle moves. The normal retraction length is set in the range of 6-10mm. Of course, it depends on the characteristics of the filaments. 2....