Q1:No filament coming out when the print starts

1.The nozzle is empty of filament before starting the print.

Most extruders will purge any melted filament from the nozzle during the high-temp hovering state, but this can sometimes lead to the filament drying out and creating a void in the nozzle. This can cause a delay in the filament flow or no flow when starting the print. To solve this, it is important to make sure there is enough melted filament in the nozzle before starting the print. The most common solution is to add “skirt”, which draws a few circles around the print before starting, ensuring enough melted filament in the nozzle.

2.The nozzle is too close to the build plate.

If the nozzle is too close to the build plate, there may not be enough space for the melted filament to flow out. This can lead to no filament coming out until the 3rd or 4th layer. To solve this, try adjusting the level, adjusting the first layer height in the slicer software, or adding a Z-axis offset.

3.The filament has been chewed off by the extruder gear and has lost grip.

If the filament has been chewed up by the extruder gear, it may have lost grip and be unable to move forward. In this case, the filament will need to be reloaded after removing the damaged portion.

4.The nozzle is clogged.

If the above solutions do not work, the nozzle may be clogged with debris. Clearing the nozzle may require disassembling the extruder, which may void the warranty, so it is important to consult the manufacturer first. Tools such as drill bits, acupuncture needles, or guitar strings can be used to clear the nozzle, depending on its diameter.