without restraction or too small restraction cause this issue.

When slicing a G-code file for 3D printing, it's important to set a good retraction value to avoid problems such as stringing, oozing, and blobs. Here are the steps to set a good retraction:

  1. Determine the ideal retraction distance: This is the distance that the filament is pulled back from the nozzle to prevent oozing during travel moves. The ideal retraction distance varies depending on the printer, filament, and print settings. As a general rule, start with a retraction distance of around 1-2mm and adjust as needed.

  2. Determine the ideal retraction speed: This is the speed at which the filament is retracted from the nozzle. The ideal retraction speed is also dependent on the printer, filament, and print settings. As a starting point, try a retraction speed of around 25-40mm/s and adjust as needed.

  3. Adjust the retraction settings in your slicer: Most slicers have settings for retraction distance and speed. You can find these settings under the "Extruder" or "Filament" settings. Adjust the settings to match the values you determined in steps 1 and 2.

  4. Test your retraction settings: Once you have set your retraction settings, print a test object that includes travel moves. Look for any signs of stringing or oozing, and adjust your retraction settings as needed.

  5. Fine-tune your retraction settings: Fine-tune your retraction settings until you achieve the best results for your specific printer and filament. You may need to experiment with different retraction distances and speeds to find the ideal settings.

Remember, setting a good retraction is just one of many factors that affect print quality. Other factors include layer height, print speed, temperature, and cooling. It's important to optimize all of these settings to achieve the best possible print quality.

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