Note: if it is very difficult to remove the filament, even when much hotter than 100, you likely are dealing with the creality bowden gap issue, below.Ĭause: Bowden gap. Now heat the nozzle and at around 100 C try to remove the filament by hand, if there is debris on the end cut it off and do the process again until the filament comes out clean. Let the nozzle cool (this is to trap dirt in the melted filament). to Do a cold pull: heat the nozzle and push filament through. What to try: Run a nozzle cleaning needle through the nozzle to clear debris. We’ve found 35 mm/s to be a good speed for retraction on Creality machines.Ĭause: A clog: Dirt and debris build up in the nozzle can cause underextrusion issues like this one. If your speed is high (say 70 mm/s) try slowing down. You can also adjust your retraction speed: Retracting or detretracting too fast can cause the printer to skip steps, negating some of the retraction benefits and causing extrusion issues. In Cura it is “Travel → retraction extra prime amount”. In prusa slicer the setting is found at: “Printer Settings → extra length on restart”. In Cura it's under Travel -> Retraction Extra Prime Amount. In PrusaSlicer set this in Printer Settings -> Extra Length on Restart. If that fixes it, great! If you find you have to go higher than 0.2, then it is likely you have one of the other issues below. What to try: Add a small amount of extra prime in your slicer, you can try 0.05, 0.1, 0.15 or up to 0.2. Instead you will want to turn on extra prime. Unfortunately, boards included with Creality machines including the Ender 3 do not support this (even with a firmware update as the stepper drivers are not compatible with this feature). If your printer supports this then you you will want to follow a guide to tuning that for your printer. The ideal solution to this problem is called linear advance which helps maintain constant pressure. If your model is complex and has lots of gap fills the issue is even more likely to occur. This is a common issue that is difficult for slicers to solve. Cause: Pressure loss due to retraction If this happens all the time and isn’t a new issue, then it may simply be that your printer is just losing a little bit of plastic before travelling, and needs a little help creating the pressure again.Here are a series of causes and what you can do to fix it. How to fix it: The issue can be caused by a few different things.
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