How to Unclog 3D Printer Nozzle: A Step-by-Step Guide

Solutions. First, clean the nozzle using a damp cloth or an alcohol wipe while the nozzle is hot . This may cause some steam but will indeed remove any material clinging to the nozzle. If this doesn't work, you can also use a wire brush, small blade, or needle to remove any remaining debris from the nozzle.

Printing with a 3D printer is an exciting and creative process, but it can be frustrating when things don’t go as planned. If you’ve experienced a print that comes out stringy, sparse, or with mixing layers, you may have a clogged nozzle. But don’t worry, it’s a common problem and can be fixed with the right tools and techniques.

Here’s a step-by-step guide on how to unclog a 3D printer nozzle:

Step 1: Check if your nozzle is clogged

Disengage the extruder gear lever and push filament through by hand. If it curls, is hard to push through, or doesn’t come through at all, the nozzle is clogged.

Step 2: Use a brass wire brush

Use a brass wire brush (not a steel brush as it could damage the nozzle) to clean the nozzle.

Step 3: Perform a cold pull

Use cleaning filament or nylon filament to do a cold pull. Heat up the nozzle to 250 degrees Celsius and push the filament through. Then, pull down your extruder to room temperature to solidify the filament in it. Set the hot end to 115 degrees Celsius and at 90 degrees Celsius, start pulling on the filament until the filament comes out the side of the extruder. Heat up the nozzle to 250 Celsius and push the filament through until it comes out clean and easy.

Step 4: Remove the nozzle

Use a crescent wrench to hold onto the heater block while using the socket wrench to twist off the nozzle. Be careful not to touch any of the hot parts as it’s easy to slip and burn yourself. Use chemicals to dissolve the filament and wash out the clog, or use heat to burn it out.

After using any of these methods, you should be able to look down the opening of your nozzle and see through the tip without any blockages.

By following these simple steps, you can unclog your 3D printer nozzle and get back to creating amazing prints. For more information on 3D printing, visit


How do you unblock a nozzle?
Using acetone is most effective with ABS filament. PLA, for its part, can be dissolved using ethyl acetate. [2] With this method, simply submerge the nozzle in the acetone or solvent for a few hours. From there it should be easy to remove what is left of the filament particles that caused the clog.
How do you tell if your nozzle is clogged?
The filament is not extruded out of the nozzle consistently.Printed lines look much thinner and sometimes not sticking to the build plate.The extruded filament is curling up and sticks to the nozzle when purged.