3D printing technology – Cartesian versus Delta
The 3D printing market is quite competitive, so there are plenty of different printers to choose from. Each printer has its own 3d printing technology and unique capabilities, so it’s important to know which printer is most suited for the results you want to achieve. As most 3D printers, Tractus3D printers uses Fused Filament Fabrication (also known as FDM technology), which means everything is printed layer by layer.
In FDM technology, two types of printing systems can be distinguished: Cartesian and Delta. The biggest difference between these two systems is the method of moving. Because each system has its own way of moving, you can achieve different results.
First more about the FDM technology
There are several different 3d printing technologies, but the most used is Fused Deposition Modeling (FDM). The FDM technology is a Stratasys-patented additive manufacturing 3D Printing method of rapid prototyping. This process is also known as FFF 3d printing (Fused Filament Fabrication). FDM technology is very popular. Over the past two decades, the FDM printer has become even the most used 3D printing technology in the world.
With FDM technology, the extrusion nozzle moves over the build platform horizontally and vertically. Thermoplastic material is heated to its melting point and then extruded, layer by layer, to create a three dimensional object. Each of these layers can be seen as a sliced horizontal cross-section of the eventual object. Once a layer is completed, the base is lowered to make room for the next layer of plastic. Once an object comes off the FDM printer, its support materials can be removed.
In FDM technology, there are two types of printing systems: Cartesian and Delta. The biggest difference is the method of moving. We will explain…
Delta 3D printer
Delta printers also use the Cartesian coordinate system, but do not use linear-motion tracked movement to deposit the filament. Instead, they use three arms, each consisting of a parallelogram. They also move from one X or Y point to another, but do so by changing the angles of these parallelograms. The arms of a Delta printer hang down from a fixed platform. All of the mechanics that drive the motion of the arms are located in that platform. As a result, the print head of the Delta printer is a lot lighter than if it also had to contain motors for movement. This reduced weight leads to reduced inertia. By reducing the inertia, particularly at the end of a movement, the production head is able to respond quickly, while retaining its accuracy.
A Delta printer usually features a circular print bed, which is immovable. Due to its circular print bed, the natural shape of a Delta printer is a circle. Therefore, rectangular objects tend to be rather small in comparison to a Cartesian printer. What a Delta printer excels at, in comparison to the Cartesian printer, is its capability to build tall objects. Especially the highest point of the print can be made exceptionally accurate. It is also fairly easy to make them bigger, especially in height, due to their design. With an overall less complicated construction and less parts to be used, it reduces maintenance and costs. If you do not need a lot of horizontal space, but instead want to build a lot of layers on top of each other, then you should definitely consider a Delta printer.
Its downside comes in the fact that a Delta printer must be much taller than its build volume, due to the arm construction of the machine. This is why you will generally need more space to place your printer than you would with a Cartesian printer.
Delta 3D printer disadvantages
- Big, requires more space
- Difficult to pinpoint errors
- More difficult to print objects with large surfaces
Delta 3D printer advantages
- Excels in printing in height
- Light, thus easy to move
- Instant change of direction possible
- More accurate in the centre than on outer limits
- Easy to maintain and upgrade
- High print speed and accuracy
See how this Delta 3D printing technology works
Cartesian 3D printer
Cartesian printers owe their name to the Cartesian coordinate system they use, which was invented by Rene Descartes. They don’t just function based on an X and Y coordinate system, but also drive the print head on a mechanism that travels linearly on both the X and Y axis.
Cartesian printers move from left to right, front to back and up and down. Simply put, it gets from A to B by moving just one axis at a time. Most Cartesian printers consist of a square, moving print bed. Instead of having the nozzle move towards the print bed, the print bed moves towards the nozzle in some cases.
Cartesian printers see their downside in the fact that their moving parts are quite heavy. Because of this, it is hard for a Cartesian printer to stop or change direction in an instant. The constant jerking of the platform can lead to prints coming loose and to inaccurate prints, especially when the prints get higher.
Cartesian 3D printer disadvantages
- Hard to modify due to spatial constraints
- No instant change of direction
- Not fit to print tall objects
- Small build volume
Cartesian 3D printer advantages
- Excels in width prints
- Easier to learn due to understandable kinematics
- Consumer friendly
- Easy to enclose most models due to cubic frame