100% Solved - Clean Blocked Extruder Nozzle in 3D Printing




About: Tech nerd like web technologies and gadgets. Kitesurf on weekends and recently got involved in 3D printing technology.

Signs of blocked nozzle when filament are not extruding uniformly, extrude very thin filament than usual or not coming out from nozzle.

What you need: (It will cost you less than $15)

1. Acetone ($7 for small bottle)
2. Torch (Available on eBay at around $5)
3. Very thin wire

Important note: Please read your user manual before removing it from the block. Some 3D printers require heat to remove and install.

Step 1: Soak the removed nozzle into acetone for about 15 minutes to clean out exterior dirt. Use a tissue paper/cloth wipe clean the nozzle.

Step 2: Place a nozzle on a stone and burn it using the torch for about 1 min. Make sure it is extremely hot until you see slight changes in the colour.

Step 3: Use a very thin wire to clear the hole in the nozzle. If the wire cannot go through repeat step 2 again until the can go through. You do not want to scratch/damage the internal wall of the nozzle. Do not force through the hole with the wire. I use soft copper wire stripped from an unused phone cable.

If everything goes well, the nozzle should extrude nice smooth thick filament.



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    6 Discussions


    2 years ago

    Not best way to clean up nozzles. It may damage the nozzle if it gets to hot.

    Better heat it up in a stoven like I commented below the video on youtube!


    3 years ago

    Guitar string is great but there is already a tool availabke for cleaning the nozzles. I have used them for years. They are madenfor cleaning the small holes of torches for Oxy/Acetaline welding... The tool has several sizes and you fold out the size you need. The wires are similar to guitar strings.


    3 years ago on Introduction

    Interesting. I've read that acetone is best used for ABS filaments, that it tends not to work well with PLA. That said, have you tried it with PLA?


    4 years ago

    I would just use a heat gun actually, as a torch might burn plastic and harden deposits. that's what I have been doing anyhow.


    4 years ago

    I have found that a guitar string is a great wire to clean or unclog the nozzle.

    1 reply

    Reply 4 years ago

    You are genius! I was searching high and low for very thin wire and I didn't thought of using guitar string. I will use guitar string next time :)