Stringing and oozing
Stringing and nozzle oozing are the two most common printing problems that have same the same root cause. Very high printing temperatures and/or using incorrect retraction settings. Stringing usually appears when your print settings are not accurate and are printing complex objects (such as Moon city) or multiple objects at once. This is recognizable as a string of plastic left behind between the object/s. In other words, it’s that hairy bit of plastic we don’t like to see.
This can be solved by changing a couple of settings in PrusaSlicer. You should start by checking a parameter known as Retraction. What does retraction do? When the extruder has finished printing one section of your model, the filament is then pulled back into the nozzle.
- Check the tension bolts – Before you touch any of the settings, make sure that the Tension bolts located on the extruder idler are properly tightened, although, this is not that common.
- Use proper printing settings – We highly recommend using the preset settings in PrusaSlicer. However, if you are printing with your own settings, make sure that you have the retraction settings set correctly. Retraction settings can be found in Printer Settings – Extruder 1.
- Try to lower the nozzle temperature – Lowering the temperature will minimize stringing. Therefore, you can try to decrease it by 2-5°C. Do so only for materials which are experiencing strings, if you lower the temperature too much, the extruder can clog.
Don’t bother, just use a heat-gun!
If you don’t feel like tweaking any of the settings, well, then there is an alternative. You can get rid of the strings with a heat gun (or possibly with a lighter). Just set it to around 200°C and aim at the strings for one or two seconds. This will melt the strings, and the printed object should remain undamaged.