When people think of 3D printers, they usually think of Cartesian-style FDM printers, such as the Prusa i3 or the Ultimaker 2. That’s no surprise, since they’re by far the most common type of 3D printer on the market.
These printers are labeled as Cartesian because they move along the Cartesian plane (like the one from math class). For these printers, movements occur along the X, Y, and Z axis rods. That is, the extruder or bed move left, right, forwards, backwards, up, or down.
Delta FDM printers, however, use a different system of movement. Instead of XYZ rods, delta printers support the extruder with three arms, which are attached to three vertical posts arranged in a triangle.
Each arm can only move vertically up and down, but by moving each arm independently the extruder is able to move in all directions. See for yourself in the video below — it’s fascinating to watch!
Delta-style and Cartesian-style FDM printers have the same main parts, such as the extruder, bed, or motors — they’re just arranged and placed differently. As such, you wouldn’t be able to tell for sure whether a finished print was made with a delta 3D printer.
Delta printers print with the exact same filament as well, such as PLA, ABS, flexibles, and other exotic filaments.
And that’s where the similarities end.
Delta printers are built for fast printing, with heavy motors and extruders fixed on the sides and top. The toolhead is kept very light and minimal so that the printer can maintain high accuracy at high speeds.
The bed of a delta printer is usually circular instead of rectangular, and it never has to move. Though the average bed size is pretty small, the build height tends to be much taller than Cartesian printers. As such, a typical delta 3D printer has a print space that looks like a tall cyclinder.
In case you’re wondering, delta and Cartesian aren’t the only movement systems out there: Read about polar and scara printers here.
Ultimately, the decision to buy is up to you, but to help, here’s a summary of the pros and cons.
If you’re wondering what the best delta 3D printers on the market are, check out our curated list here: Best Delta 3D Printers of Summer 2018
License: The text of "What is a Delta 3D Printer? – Simply Explained" by All3DP is licensed under a Creative Commons Attribution 4.0 International License.
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