3D printers can turn digital designs into physical objects. It's a fascinating process that opens up a lot of possibilities in fields like engineering, design, and even healthcare. It's also a fun way to create DIY projects at home. Understanding how the different 3D printer parts work is an excellent introduction to 3D printing.

Pri​​​​nt Bed

The print bed is a flat surface you will find at the bottom of the printing enclosure. The print bed is the area where the printer creates objects.

Depending on the 3D printer you have, the print bed material will either be plastic or aluminum. Some printers have a glass print bed.

Some print beds have an adhesive layer that keeps objects in place. Hobbyists often add adhesive elements to prevent shifting during the printing process.

Some 3D printers have a heated print bed. The purpose of a heated print bed is to maintain a steady temperature throughout the printing process to prevent warping. A printed object will show signs of warping if an uneven cooling happens. Keeping the object heated during the printing process allows for an even cooling process after printing is over.

You can find 3D printers with adjustable print beds. You might have to manually adjust the height of the print bed with a knob to match the size of the item you want to print. Some printers have an automatic adjustment feature.

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Controller Board

The controller board of a 3D printer is similar to a small computer. There is a microcontroller that receives data from the computer you connect to the printer. This part transforms data into instructions for the different 3D printer parts.

The controller board makes the different parts of the printer move to achieve the desired result.

Hot End

The hot end is one of the most essential components of a 3D printer. This part melts the filament and prints a physical object with melted plastic or metal.

The melted filament comes out of the nozzle attached to the hot end. The design of the hot end varies a lot from one printer to another.

All hot ends have a tube at their center. The filament goes through this tube and melts due to the heat. Here are the different elements you will typically find inside of the hot end:

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  • Filament guide. The filament guide is a stainless steel tube. This tube usually has a liner that insulates the other parts from heat. The filament goes through this tube as it melts.
  • Heater cartridge. This component generates heat to melt the filament. Most printers have a ceramic heater cartridge.
  • Heat block. The heat block is the component that connects the cartridge to the nozzle of the hot end. It channels and transfers heat to the filament. Aluminum is the most common heat block material.
  • Thermistor. The purpose of the thermistor is to measure the temperature of the heat cartridge. Advanced 3D printers use a sensor that sends data to the motherboard, but some models use a glass bead.
  • Heat sink. The heat sink element channels some of the heat out of the hot end. The purpose of this component is to regulate the temperature of the hot end. You will typically find the heat sink attached to the side of the filament guide.
  • Heat break. The heat break is a small stainless steel tube. You can find this tube between the heat block and the heat sink. The melted filament goes through the heat break after being in contact with the cartridge.


The nozzle is the component you will find at the end of the filament guide. The nozzle is a crucial component because it determines how the melted filament comes out.

There are different sizes and designs, and most 3D printers come with interchangeable nozzles. Sizes range from 0.8mm to 0.25mm for the opening of the nozzle. A nozzle with a narrow opening will result in more precise printing.

A narrow opening creates thin lines and layers. This printing technique results in sturdy objects and allows for a high level of details. However, it increases the printing time.

A larger nozzle allows you to print with larger lines and fewer layers. You can print faster but will lose some accuracy. Large nozzles are less likely to get clogged and suitable for filaments with a larger diameter.

The best nozzle depends on how much accuracy you need for your project and on the material you want to use. Make sure the diameter of the filament you use is a good match for the nozzle.

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Cooling Fans

You will find a small cooling fan attached to the side of the hot end. The purpose of this fan is to lower the temperature of the hot end. 

Without the cooling fan, heat would spread outside of the filament guide and damage the different parts of the hot end.

Some printers have additional cooling fans. Industrial 3D printers typically have larger fans within the enclosure. These fans can regulate the cooling process of the part and lower the temperature inside of the enclosure.

Some printers have fans pointed down on the print bed. These fans cool down the filament once it comes out of the nozzle to make sure the object cools down evenly.

A small 3D printer designed for simple DIY projects might lack cooling fans. Adding a fan in the enclosure is a great way to upgrade a basic 3D printer.


Some printers have more than one extruder so you can easily switch between different materials or filament sizes when printing. The purpose of the extender is to feed the filament to the hot end. The extender controls the speed at which the filament goes through the print end.

The extruder design and location varies from one 3D printer to another. Most extruders use a spinning motor to pull the filament through the extruder and feed it into the hot end at a steady pace.

Small 3D printers designed for at-home use typically have a direct extruder. This component sits directly on top of the hot end. The filament turns on a motorized spindle and goes directly into the hot end.

You can find 3D printers with an extruder that is further away from the hot end. Manufacturers can attach the extruder to the side of the printing enclosure and have the filament run through a tube to reach the hot end.

This design allows for more precision. The vibrations of the extruder can impact the hot end and decrease the accuracy of the result. The hot end needs to change directions and perform small movement adjustments to print on a small scale. The vibrations of the extruder impact those small movements the most.

A fixed extruder on the side of the enclosure won’t impact the hot end. It also reduces the weight of the components that move when the 3D printer is creating an object. 

Arms And Motors

3D printers use different parts to move the hot end and print objects. Depending on the 3D printer you own, arms or motors might move the hot end.

Some printers use motorized belts to move the hot end back and forth across the print bed. This design is simple and affordable, but it limits the printing techniques that you can use. If the hot end can only move in a back and forth motion, you will need to use layers to create objects.

Some motors come with additional small motors that allow for more precise movements. The hot end can still move along a back and forth axis in the printing enclosure, but those additional motors allow the hot end to move in a three-dimensional fashion. Printers that use those additional motors will enable you to work with a higher level of details.

You can also find printers with four arms that can move the hot end across the axis. This design is standard in commercial and industrial settings.

Different switches and sensors control the position of the arms. Some printers have threaded rods along those arms. Nuts move up and down the arms to control the movements of the hot end.

The most advanced 3D printers use motorized arms to control the movements of the hot end. These printers are larger and more expensive than other models, but they allow for a high level of precision.

The arms, motors, and other components that move the hot end are a significant consideration when choosing a 3D printer. These parts usually impact the cost of a 3D printer and determine the level of details you need for your project.

Print Display

Most 3D printers have a small OLED or LCD screen. The purpose of this display is to show information about the printer status, display error messages, and let you know how long the printing process will last.

Some printers feature controls you can use to start and stop the printing process or adjust features such as printing speed or temperature.

3D printers designed for at-home use typically have simple LCD screens and don’t have many controls. You can see more information about the printer status and adjust settings by using companion software on a computer.

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Filament Holder

One of the most essential 3D printer parts is the filament holder. You will typically find the spool holder attached on the side of the printer. If your printer has an enclosure, you will notice that the spool holder is outside of the enclosure. Manufacturers usually choose the location of the filament holder to reduce exposure to heat and preserve the filament.

You need to mount a filament spool on the holder to start printing. Find the extremity of the filament spool and feed it into the extruder. There is a feeder element with a small wheel that will grab the filament and start feeding it into the extruder.

Read the instructions that came with your 3D printer to figure out how to load the filament into the extruder. You might need to feed the filament into the extruder and wait a few minutes before printing to make sure the filament reaches the right temperature and consistency.

Frame And Enclosure

The frame is the case that protects the different components of a 3D printer. Some printers have a small frame mounted on top of the print bed to support the hot end. Other printers have a sturdy frame that protects all the moving parts. 3D printer frames typically have a square or rectangular design.

The enclosure is an element that covers the hot end and print bed. Not all printers come with an enclosure, but it's an exciting feature that you should consider.

The enclosure protects the object you are printing and helps maintain an even temperature inside of the printing area. It protects you from accidental exposure to hot materials. An enclosure is a must-have security feature if you print with metal.

Enclosures typically have clear sides so you can monitor the printing process. It’s possible to build a simple enclosure and add it to a small 3D printer if you want to upgrade your printer and make it safer to use.

Power Supply

Your 3D printer might come with an external power supply, but some models have a built-in power supply. Most 3D printers run on 12V or 24 DC power.

You can plug your printer into a traditional outlet, and the power supply will convert the current to DC power with a lower voltage.

If you use a small 3D printer, you will notice that the power supply element is very similar to the one you use for your laptop.

Finding out about the different components of a 3D printer should give you a better idea of how these devices work. If you have a 3D printer, take the time to read the owner’s manual and any additional resources from the manufacturer since designs can vary a lot from one printer to another.


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