How to Fix Under Extrusion in 3D Printing: Simple Solutions

Under extrusion in 3D printing happens when the printer does not push enough filament through the nozzle, causing gaps or weak layers. To fix it, check for clogged nozzles, adjust the extrusion multiplier or flow rate in your slicer, and ensure the filament feeds smoothly without obstruction.

Why This Happens

Under extrusion occurs when the 3D printer's nozzle does not receive or push enough filament during printing. This can be caused by a clogged nozzle, incorrect extrusion settings, or mechanical issues like a slipping filament gear.

gcode

M221 S70 ; sets flow rate to 70%, too low causing under extrusion

Output

Print shows gaps, thin layers, and weak structure due to insufficient filament extrusion.

The Fix

To fix under extrusion, first clean the nozzle to remove any blockages. Then, increase the extrusion multiplier or flow rate setting in your slicer to around 100-105%. Also, check the filament path for smooth feeding and tighten the extruder gear if slipping.

gcode

M221 S105 ; sets flow rate to 105%, improving filament flow

Output

Print layers are solid and consistent with no gaps, showing proper filament extrusion.

Prevention

Prevent under extrusion by regularly cleaning the nozzle, using quality filament, and calibrating extrusion settings before printing. Keep the filament dry and ensure the extruder gear is clean and properly tensioned to avoid slipping.

Related Errors

Similar issues include over extrusion, which causes blobs and stringing, and layer shifting caused by mechanical problems. Over extrusion can be fixed by lowering flow rate, while layer shifting requires checking belts and stepper motors.

Key Takeaways

Check and clean the nozzle regularly to avoid clogs causing under extrusion.

Adjust the extrusion multiplier or flow rate in your slicer to ensure proper filament flow.

Ensure the filament feeds smoothly and the extruder gear is tight to prevent slipping.

Use quality, dry filament and calibrate extrusion settings before printing.

Be aware of related issues like over extrusion and layer shifting for better print quality.