Click click click – is your Ender 3 extruder making skipping, clicking, or grinding sounds? A skipping extruder is one of the most frustrating sounds to hear from your 3d printer and the Ender 3 is far from immune.
So, why is your extruder skipping?
There are two main reasons to hear your extruder clicking:
First (most common), you are trying to push much more filament through your hot end than the 3d printer can handle. The second is that the extruder arm is cracked and cannot get enough “bite” to actually move the filament, resulting in a grinding sound as the extruder chews through the filament.
To fix a clicking/grinding/skipping extruder, look for blockages, poor tension, cracked extruder arms, or too high print speeds.
Thankfully, if you hear your Ender 3 extruder clicking don’t worry: most of the time the solution is straightforward so here are ten ways you can diagnose and solve a skipping or clicking extruder.
Let’s dig in.
Ender 3 Extruder Skipping: Solutions to try
A skipping extruder is a sign that the 3D printer is trying to push filament through the nozzle but it is not flowing for some reason.
The way to diagnose this issue is to figure out why the filament is not flowing and fix the problem! We’ll start with easy solutions and progress to more difficult ones.
Check your extruder arm for cracks
Ender 3s (and the Ender 3 Pro, Max, and V2, but not the S1 series) use a Bowden tube extruder setup with a plastic extruder tensioner.
These plastic extruder tensioner arms are notorious for cracking and usually crack on the underside where you can’t see them.
If this is cracked then your tensioner won’t be able to put enough tension on your filament.
If you’re hearing more of a grinding sound, are experiencing under extrusion, or see filament shavings then this is the best place to start. Pull the extruder arm off and check underneath for cracks.
Or just use this chance to upgrade to a better extruder.
I looked at all of the cheap metal ones on Amazon but they all had pretty polarizing (or obviously fake) reviews. I ended up choosing the Microswiss dual-gear extruder as I’m working towards a 1000mm/s Ender 3 setup.
Yes, it’s more expensive but looking at the gear teeth you can see such a difference in quality VS the stock Creality ones or any of the $14 ones on Amazon.
- Fits: Bowden extruder machines, Fits NEMA 17 size stepper motors
- Made in USA by Micro Swiss
If you need a refresher, here’s a video on taking off the extruder assembly (skip to ~1m as you really only need to remove the arm).
Check your volumetric flow rate
When you think print speed you might think about the settings in Cura/your slicer – which are linear print speeds (EG 45mm/s).
But the real bottleneck is volumetric print speed (see The Illusion of Speed article for more info and how to find your printers max volumetric print speed).
A stock Ender 3 (Pro and V2 included) can push about 8.5 mm^3/s, depending on the filament type and temperature.
To calculate your volumetric print speed multiply
Linear speed (mm/s) * layer height (mm) * line width (mm).
So a 0.45mm line (extrusion) width at 0.2mm height at 45mm/s linear speed is printing at 4.05 mm^3/s, well below the 8-12 mm^3/s that a stock Ender 3 series (V1, Pro, Max, V2, not S1) can typically handle.
Put another way, if you’re printing with a 0.4mm nozzle printing at a standard 0.45mm width at 0.2mm height, you should expect to have some problems and extruder clicking starting around 88mm/s linear speed.
Leading us to our next item to test…
Increase print temperature and/or decrease speed
If you need to print something now and don’t have time for a real diagnosis, try increasing your print temperature and decreasing your print speed.
It is possible that the filament you’re using can’t melt as efficiently at the temperature you’ve set, so increasing the temperature will usually get it flowing out of the hot end as it should.
Decreasing the print speed also has a similar effect. A slower print speed means less filament has to flow out, so you’re not putting as much strain on the extruder motor.
If the higher temperature fixes the problem, you can try bumping up the print speed back to your original setting and seeing if it still works OK.
Nozzle too close to bed
Another super common issue is that the nozzle is too close to the bed. Because there is not enough space between the nozzle and the bed, the filament is not flowing out as it should.
You’ll know your nozzle is too close if you see a squished middle and two parallel lines on your first layer or ghosting.
If you have too low of an initial layer height the gears of your extruder will try to push the filament out… but there’s no room for the filament to flow.
Without flow you’ll get backpressure and, like a clog, you’ll hear a grinding or clicking noise.
Re-level your bed and try printing again, paying close attention to the first layer.
Side note, after buying my Prusa i3 MK3S+ (it’s absolutely night and day VS the Ender series… I click “print” then come back to find my finished print… no fuss), I fell in love with magnetic PEI sheets VS the glass beds that ship with the Ender 3 V2.
I bought the official Creality PEI but wish I’d seen this one first is it’s two-sided, cheaper, and from Comgrow – Creality’s main supplier in the US:
- The smooth and flat surface is flexible, removable, and can stick to magnetics very well. High strength and heat resistance. (Note: Please remove the transparent protective film on the surface before use).
- The golden yellow matte surface of PEI has strong high-temperature stability, high printing stability, flame retardant, high-temperature resistance, high strength, wear-resistance, and electrical insulation properties.
- If the magnetic sticker is stuck to the bed, it won't be easy to remove. Therefore, please make sure that measure it correctly first before removing the adhesive and stick to the 3d printer heated bed.Suitable for Ender 3/ Ender 3 Pro/ Ender 3S/ Ender 3v2/ CR 20/ CR 20 Pro/ Ender 5/ Ender 5 Pro.Compatible with PLA/PETG/PEEK/ABS and any other filaments.
- Easy to adhere to the printing surface, easy to remove the prints, flex slightly to pop your print right off. The flexible surface can easily be cut to any dimension making it perfect for all build sizes and all FDM printer models.
- When used in a 3D printing application, PEI is excellent because it can withstand the numerous heat cycles that a 3D print bed goes through from print to print.
Blockage in the extruder
Budget 3D printers like the Ender 3 (Pro/Max/V2) may not have as accurately machined tolerances in the extruder as other printers.
Also, because the Ender 3 is a Bowden setup, there are a lot more places for things to get stuck.
On top of the extruder, there is a little pneumatic coupling. The Bowden tube is inserted into the coupling, where it goes down into the extruder.
The filament moves between the motor gear and the bearing and goes into the Bowden tube. If the coupling is loose, or the Bowden tube is out of position, the filament will not flow correctly and your extruder will start clicking.
Try taking your extruder apart, cleaning it (if necessary), and reassembling it to see if that fixes your extruder clicking issues.
Blockage in the nozzle
If the extruder is not the issue, then the issue is most likely in your nozzle.
Debris or blockage in the nozzle can prevent the filament from flowing out, and your extruder’s gears will start slipping on the filament.
Cleaning the nozzle of an Ender 3 is pretty straightforward, but it can be a little cumbersome.
The first method to try is the atomic or cold pull.
To do this, remove the PTFE tube from the hot end and heat up the hot end to around 190 degrees C. Insert some filament directly into the hot end and let it start to melt.
Now decrease the temperature to 160 until the filament is still soft but no longer melting. Decrease the temperature 10 degrees more, and as it becomes a little more hardened, yank the filament out.
You should have pulled out some debris mixed into the filament.
Do this a couple of times and that should fix it.
You can also insert a very tiny needle into the nozzle while it’s hot and try to clean it out from the bottom, too.
If none of that works, you’ll have to unscrew the nozzle and clean it out yourself. Don’t forget to follow your manufacturer’s recommendations when removing or replacing a nozzle.
- Great Value: sharp quality tweezers and 10pcs of 0.40mm nozzle cleaning needles packed in one safe container!
- Anti-Static, Non-Magnetic Curved Precision Tweezers; 3D printing tweezers great for nozzle maintenance and cleaning excess support material
- 10 pcs of 0.40mm diameter flexible stainless steel needles; Ideal for gentle maintenance of your nozzles and hard to reach places like the feed gears
- Handy, safe and stylish container; All of the items come in a neat plastic tube with a screw lid to keep them safely together
- Long-lasting kit for several purposes; Remove excess plastic and clear jams with high precision, also great for general maintenance of the heatsink section.
Blockage in the hot end
If you have a clean nozzle but still no luck, you may have to remove the hot end assembly and take it apart piece by piece to find the source of the blockage.
If you’ve gotten this far, I hope you’ve double-checked you’re using the right temperature and print speed, and that you’ve leveled your bed a few times!
Open the assembly that contains the cooling fan and hot end, and remove the hotend from the carriage.
Take the whole thing apart and clean out each individual component. You may need to use a flame or heat gun to burn out any debris.
Reassemble and try again!
Replace PTFE tube
When you open up the hot end and clean it up, you may notice that the PTFE tube has degraded. In this case, you will have to replace the PTFE tube.
If you’re still on a stock Bowden tube, we suggest upgrading to the Capricorn Bowden tube kit. It’s $13 and replaces Creality’s mediocre Bowden tube with a great, well-toleranced, Teflon Bowden tube.
Calibrate your extruder steps (e steps)
If there is an issue in your printer firmware, you may need to calibrate your extruder e steps. Calibrating is a process where you manually measure and see that the extruder is indeed extruding as much filament as it should be.
To calibrate, remove the PTFE tube (Bowden tube) from the extruder so that when the printer extruders filament will go straight up.
Make a mark on the filament above the pneumatic coupling.
Now go into the menu and manually extrude 10mm of filament.
Make another mark right above the pneumatic coupling.
Measure the distance between the two dots to see if that is indeed 10mm.
If the number is off, you’ll need to adjust the extrusion steps, which you can see how to do in the video below (or see our stupid fast way to calibrate e steps):
Increase stepper motor voltage
If that still does not solve the problem, chances are your stepper motor does not have enough power, which is preventing it from overcoming the pressure required during extruding.
Here, what you can do is open up the control panel and find where the extruder motor connects to the mainboard.
Next to the connector, you’ll see a little variable resistor that looks like a small Phillips screw head.
Turning the resistor clockwise will increase the voltage flowing to the stepper motor and give it more juice to push more filament out.
I really don’t recommend trying this first as the motor is usually well calibrated out of the box, but there may be rare cases where you’ll have to try this.
How do you know if your extruder is too tight?
If your spring on your extruder is too tight the gear will start to chew through filament (rather than push it). You might hear a grinding noise and the print head might be moving without any filament being extruded.
This is much rarer than your extruder being too loose, but if you recently replaced your extruder setup and are running into issues, it’s something to check.
A clicking extruder can be incredibly frustrating when 3d printing and was one of my main pain points when I first started learning how to 3D print.
I got the hang of it soon enough and once you have your printer calibrated and printing properly, you should not run into this issue again.