How To Fix Over-Extrusion

Blobs, strings, and jams are a pain! Check out these three simple solutions that will fix your 3D printer over-extrusion problems forever!

What Is It?
The result of poor extrusion calibration
The result of poor extrusion calibration (Source: Simplify3D)

As the name implies, over-extrusion occurs when your 3D printer extrudes too much material. And as you might expect, this can ruin the quality of your prints.

Dimensional inaccuracy, layer drooping, stringing, oozing, blobs, and even jams can be the result of an over-extruding printer. If you see any of these symptoms in your prints, you’re probably experiencing over-extrusion.

Obviously, you should avoid over-extrusion if at all possible. Let’s dive into three slicer settings you can adjust to eliminate over-extrusion.

Tip #1: Lower Extrusion Multiplier

Changing the extrusion multiplier.
Changing the extrusion multiplier (Source: jpod via Zeepro Forums)

The extrusion multiplier (or flow) setting in 3D slicers determines the rate at which your printer extrudes plastic. Most slicers set this setting to a default of 1 (or 100%).

Typically, you can tell that your extrusion multiplier is off if your printer exhibits abnormally large layers or nozzle jams. If your printer is extruding too much material, decrease this setting by 2.5% increments.

If you end up decreasing this setting too much and either the problem is not eliminated or another problem is produced, you should turn to another setting.

Tip #2: Decrease Print Temperature

The effects of temperature
The effects of temperature (Source: AndyPants550 via Thingiverse)

If the above doesn’t work, try decreasing the print temperature. If the print temperature is too high, the obvious consequence is over-melted filament, which flows uncontrollably from your printer’s nozzle.

Decrease your printer’s print temperature (for the particular filament in use) in 5-degree increments until the perfect temperature for your machine and material is achieved. Again, if over-extrusion persists in your prints or another problem arises, turn to the next setting.

You can tweak this setting via repeated production of one test print or by printing a temperature tower with which you can test several temperatures for your particular machine and material.

Tip #3: Correct Filament Diameter

Checking your filament diameter
Checking your filament diameter (Source: chrischin via PrusaPrinters Forum)

One terrible but extremely common cause of over-extrusion is an incorrect input of filament diameter. Three common filament diameters are 1.75 mm, 2.85 mm, and 3 mm. If your slicer assumes a thinner filament diameter than you’re actually using, the extruder will extrude your filament at a higher rate. This results in over-extrusion.

Hopefully, the correction of one or each of these settings will eliminate the effects of over-extrusion in your prints.

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