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Oozing, Stringing – Biggest challenge in 3D printing service – How Crenodez handles it?

When small plastics are left behind after 3D printing, oozing occurs. This basically happens when the plastic oozes out of the nozzle while the extruder moves to another point. At Crenodez, we carefully handle any challenge in 3D printing and ensure giving you a quality output

Retraction is the most typical setting that is utilized to prevent excessive stringing. When retraction is enabled, the filament will be dragged back to the nozzle to prevent oozing once the extruder has finished printing one area of your creation. The filament will be forced back into the nozzle when it is time to start printing again, causing plastic to start ejecting from the tip once more. 

We will go over a few settings that can be used as the crucial retraction settings in the sections below. This is one important challenge in 3D printing that has to critically taken care of.

The retraction distance

The retraction distance is the most crucial retraction setting. The quantity of plastic drawn out of the nozzle depends on this. In general, the nozzle is less likely to leak while moving the more plastic is retracted from it. 

Try increasing the retraction distance by 1mm and retesting to see if the performance improves if you experience stringing with your prints.

The retraction speed

Retraction speed is the next setting you should examine. This controls how quickly the filament is drawn back into the nozzle. If you retract too slowly, the plastic may begin to slowly seep through the nozzle and begin to move to its new location before the extruder is finished moving. If you retract too quickly, the drive gear may grind away some of your filament or the filament may split from the hot plastic inside the nozzle. 

Retraction often functions best in the range of 1200-6000 mm/min (20-100 mm/s).

The Extruder Temperature

The extruder temperature is the second most frequent reason for severe stinging after you have checked your retraction settings. The plastic inside the nozzle will become less viscous and leak out of the nozzle much more readily if the temperature is too high. The plastic will, however, still be somewhat solid if the temperature is too low and will have a hard time extruding from the nozzle. 

If you believe your retraction settings are accurate but you are still having similar problems, consider lowering the temperature of your extruder by 5 to 10 degrees. The final print quality may be significantly impacted by this.

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Long Movements

Stringing happens when the extruder moves between two positions, and during that movement, plastic begins to drip out of the nozzle. The amount of oozing that occurs can vary greatly depending on how long this movement lasts. Short movements might be swift enough to prevent the plastic from oozing out of the nozzle. Longer movements, however, are considerably more likely to result in strings.

A very short distance for the nozzle to travel over an open area is ensured by the software’s ability to automatically modify the travel path. Click on the Advanced tab and enable the “Avoid crossing outline for travel movement” option.

Extruder Movement Speed

Lastly, you might also discover that accelerating the machine’s motion will shorten the time the extruder can ooze between components. By selecting the Speeds tab in your process settings, you can see what movement speeds your machine is using. The length of time your extruder spends travelling over open air is typically directly correlated with the X/Y axis movement speed, which measures the side-to-side travel speed. 

Increasing these parameters may also help to lessen stringing between sections if your machine is capable of operating at greater rates.

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