---
title: 5 things to learn on Extruder – Core part of a 3D printer
description: 3D printer extruder is known to be the core of a 3D printer. Check out this blog post on the 5 things to learn about 3D printer extruder. Click to reveal
image: https://www.cmac.com.au/hubfs/Untitled%20design%20%2818%29.png
---

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# Blog

## [5 things to learn on Extruder – Core part of a 3D printer](https://www.cmac.com.au/blog/5-things-about-extruder-core-part-3d-printer)

Posted by [Aaron Chen](https://www.cmac.com.au/blog/author/aaron--chen) on 11/08/2019

![extruder of 3d printer](https://www.cmac.com.au/hs-fs/hubfs/Untitled%20design%20(18).png?width=190&name=Untitled%20design%20(18).png)

Extruder is considered as one of the important [components of a 3D printer](https://www.cmac.com.au/blog/how-3d-printing-3d-printer-work). It is the part of the 3D printer responsible for drawing in, melting and pushing out the filament.

It is often called a “fancy hot glue gun”. In some cases, it serves to deposit a bonding agent to solidify the material that is in powder form. It is small but it is where the “main” printing procedure happens.

Since the extruder is the core part of a 3D printer, it is beneficial for you to understand the basics of an extruder. Hence, here is a blog post on the 5 things about 3D printer extruder.

1. ## **What is an extruder**

The [extruder](https://www.sculpteo.com/en/glossary/extruder-definition/) is a part of a 3D printer where material is ejected in liquid or semi-liquid form. It is deposited in successive layers within the 3D printing volume. At times, the extruder only serves to deposit a bonding agent. This bonding agent is also used to solidify the material which is originally in powder form.

1. ## **Main elements of an extruder**

An extruder has two main elements. These are the cold end and hot end. The cold end refers to the upper portion of the 3D printer extruder system where the filament is fed. On the contrary, the hot end is where the filament gets melted and squirted out.

- **Cold end**

The cold end consists of stepper motor, some toothed gearing, hobbed bolt or gear, spring loaded idler to hold the filament and PTFE tubing to guide the filament.

In the cold end, the stepper motor drives the motion and extrusion of the filament for most of the desktop 3D printers. It is a brushless DC motor that is responsible for achieving high level of precision. It works on small movements and imparts full torque at low speeds.

- **Hot end**

If the cold end manipulates the filament as required by the 3D printer, the hot end, on the other hand, is where the [filament passed for melting and extrusion](https://filament2print.com/gb/blog/36_types-3d-extruders-and-hotend.html) onto the print end.

In the hot end, the filament should pass into a heated chamber where it transitions from solid to liquid. For a Bowden 3D printer extruder, a filament feed tube inserts the filament directly into the heat break through the heat sink.

During the printing process, the filament travels from the cold end into the hot end. It will then go through the heat break where it meets the nozzle. This is where the filament liquifies.

One of the integral components of the hot end is the nozzle. It is a small piece with a hole where the melted filament comes out. It is usually screwed into the hot end heater block. Nozzles are typically interchangeable. It comes in various sizes but the normal size is 0.4mm.

1. ## **Types of extruder**

The extruder has [two different types](https://all3dp.com/2/direct-vs-bowden-extruder-technology-shootout/) depending on the drive. These are Direct extruder and Bowden extruder.

- **Direct extruder**

In direct extruders, the hot end and cold end are simply attached together. In this setup, the [filament](https://www.cmac.com.au/blog/what-filament-suitable-for-your-3d-printing-project) goes straight down through the cold end and into the hot end.

One of the main benefits of a direct extruder is the very short distance between the drive mechanism and the hot end. This means that it more responsive to extrusion and retraction. As a result, it can produce clearer prints with less stringing and oozing.

Moreover, the shorter distance between the drive mechanism and hot end can make printing with flexible materials a lot easier.

However, because direct extruders are directly attached to its hot end, there is also a possibility that its mass will be moved along with the hot end. This means that as more mass are moved around, it will likely to backlash, overshoot and frame wobble.

- **Bowden extruder**

In [Bowden extruder](https://www.fabbaloo.com/blog/2015/11/11/bowden-or-direct-a-primer-on-extruder-styles), the hot end and cold end are not directly attached to each other. Instead, there is a tube that extends from the extruder to its hot end.

With this setup, the printer will be able to print faster, more accurately and more precisely than 3D printers with direct extruder.

Nevertheless, the most common weakness of Bowden extruder is that it is prone to retraction and stringing. Additionally, since the idler/gear pinch point and hot end are far from each other, there is a chance that the hysteresis (lag) of the system will increase.

1. ## **3D printing technologies that require an extruder**

3D printing uses different methods in printing. Some of these 3D printing technologies require an extruder while others don't. Below are some printing technologies that will require an extruder for printing.

- **FDM/FFF**

[FDM](https://www.cmac.com.au/blog/introduction-most-commonly-used-3d-printing-technology-fdm) printers use material extrusion process wherein the material is being melted and extruded through a nozzle to print a cross-section of an object. This is done layer by layer at a time.

- **Binder Jetting**

There are some Binder Jetting printers that have extruder which projects a bonding agent onto a successive layer of powder material to create a 3D object.

1. ## **Common extrusion problems that you might encounter**

Here are the [common extrusion-related problems](http://blog.3dprinters-shop.com/solve-common-3d-printing-issues1-extrusion-problems/) that you might encounter while printing.

- **Under-extrusion**

Under-extrusion happens when the 3D printer cannot supply or extrude the right amount of material. Most of the time, it will result in missing layers, little dots or holes in layers or unwanted gaps which make the design incomplete. Print quality and print strength are sometimes compromised when under-extrusion happens.

- **Over-extrusion**

Over-extrusion occurs when the 3D printer supplies more material than needed. This will result in dimensional inaccuracy, layer drooping, stringing, oozing, etc. thus, ruining the quality of 3D prints.

## **Conclusion**

Knowing the basic things about 3D printer extruder is important since it is where the “actual printing” happens. Most specifically, it is where the filament gets drawn in, melted and pushed out. Moreover, 3D printers with extruders (material extrusion method) are what the majority of 3D makers and hobbyists used nowadays.

If you are interested in trying [new things with 3D printing](https://www.cmac.com.au/3d-design-printing/3d-printing-services-sydney), you can ask for help from a 3D printing service provider. They can offer services according to your 3D printing requirement.

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\*\[Nursery Manager\]\* At an exhibition saw our self tracking nursery trailers and indicated he had a costly issue transporting large (heavy) pots containing advanced trees. Existing method was a bobcat. C-Mac designed and quoted for the manufacture of a Self Tracking “Low Loader”. His comment on the first day of using "Low Loader trailer":nursery-equipment/7-trailers/#low-loader-self-tracking-trailer “Can now move 100 litre pots with trees, 150 metres in 1 hr and not get a sore back”.

\*\[Purchasing Officer\]\* A mining design and machining company needed help with machining components urgently as they were too busy to keep up with the demand. C-Mac machined the components so the deadline could be met.

\*\[General Manager\]\* Customer had to submit a proposal and compete against other countries for the manufacturing facility. C-Mac submitted drawings to show there was space in existing plant to install the new process and to comply with all Australian OH&S Standards. Working together with customer to submit proposal to the Head Office overseas WON the contract. Project was a success meeting 6month lead time and budget.

\*\[Nursery Owner\]\* Needed a specific Potting & Mixing machine. for his yuccas nursery, but the problem was it was no longer manufactured. From his description and specifications our engineers designed and modelled in 3D software his requirements. "Potting Machine":nursery-equipment/3-potting-machines/ was manufactured and fully tested with potting media in our workshop, video was then sent to customer who was very pleased with the results. Machine disassembled and freighted interstate and installed.

\*\[Maintenance Engineer\]\* An industrial hydraulic fitting manufacturer had problems with gear and shaft breakages with their machinery. They also had problems repairing and maintaining. C-Mac offered to repair and maintain their machinery on-site instead of having to permanently employ fitters.

## Information

- [About](https://www.cmac.com.au/about-us/our-history)
- [Careers](https://www.cmac.com.au/employment)
- [Blog](https://www.cmac.com.au/blog)
- [Contact Us](https://www.cmac.com.au/contact)

## [Locate Us](https://www.cmac.com.au/contact)

21/64 Drummond St   
South Windsor NSW 2756

Phone: (02) 9631 6000  
![](https://www.cmac.com.au/hs-fs/hubfs/images/infocmac.com.au.jpg?width=170&name=infocmac.com.au.jpg)

Copyright 1966-2022 @ C-Mac Industries Pty Ltd<http://www.KungfuMarketing.com.au>

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