Retracting only a very small distance won’t probably solve stringing, whereas exaggerating this value will cause no plastic to be available in the nozzle during the initial moments of the next extrusion. Retraction distance tells the printer how many millimeters of filament to retract when required. I should clarify that I’ll use the naming convention from Cura, but the same principles most definitely apply to all slicers. You will find equivalent parameters on many slicers. From now on, we will focus on Cura settings. Source Parameters related to retractionįirst, we must make sure that the “enable retraction” box is activated, to access the retraction parameters. A 3d printer miniature chair featuring stringing issues. Take a look at the following image of a chair that features a good amount of stringing. ![]() You may not previously have heard about this term, but I’m almost sure that you have seen it before. This is known as “stringing” and can be avoided (or at least minimized) through some printing parameters. The over-extruded material from the nozzle will become thinner as the hotend moves, leaving a “thread” or “string” between two walls of the part. This reversal of rotation is called “retraction” and is a fundamental parameter to achieve printed objects with a good surface finish. The way to achieve this is to reverse the rotation of the extruder stepper motor, such that a few millimeters of filament come out of the hotend and compensate for said pressure. When printing requires the hotend to move from one point to another without depositing material, it is necessary to relieve that remaining pressure, in order to avoid the plastic from “escaping” during this movement. The issue with this mechanism is that there is still a remaining pressure inside the barrel after the extruder motor has stopped, which forces the filament to continue flowing through the only free outlet it has (i.e. If the temperature is sufficient, and the extruder motor steps are correctly calibrated, the plastic will begin to flow in the exact amount that is required to create the desired model. This thrust generates an increase in pressure inside the nozzle.
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