Freedom251 › 3D Printing Software
Marlin
What Marlin is
Marlin is open source firmware for RepRap family 3D printers. It runs on a printer’s mainboard and coordinates components including heaters, stepper motors, sensors, lights, displays, and buttons. It can also control CNC machines and laser engravers, and supports microcontrollers ranging from 8-bit Atmel AVR boards to 32-bit ARM boards.
For motion, Marlin includes input shaping, linear advance, fixed-time motion, and automatic bed leveling. Its listed safety functions include thermal protection, power-loss recovery, and filament-runout handling. It can operate on its own, or connect to host software such as OctoPrint for remote monitoring. Other host options documented for Marlin include Pronterface, Repetier Host, and Cura.
Marlin is free under the GPLv3 license for all applications. Firmware needs to be configured for the intended machine and board, and installation steps vary with the board, selected features, and firmware version. The project recommends PlatformIO with Auto Build Marlin to build and upload firmware; many targets can also be built with Arduino IDE. The maker community maintains Marlin, and its Discord community offers real-time help from users and developers. When PASSWORD_FEATURE is enabled, a numeric passcode can lock the machine.
Who it suits
Marlin suits people configuring firmware for a RepRap family 3D printer, as well as users working with CNC machines or laser engravers. It can fit users who want to run firmware on their printer or connect a host such as OctoPrint for remote monitoring.
What it does well
- Free under GPLv3 for all applications.
- Runs standalone on a printer’s mainboard.
- Supports 8-bit AVR through 32-bit ARM microcontrollers.
- Includes automatic bed leveling and input shaping.
- Lists thermal protection and power-loss recovery.
- Supports host options including OctoPrint and Cura.
What to know first
- Firmware configuration and installation vary by board and version.
- Building and uploading requires a compatible setup such as PlatformIO or Arduino IDE.
Plans
| Plan | Billed and limits | Price |
|---|---|---|
| Marlin Firmware | GPLv3 licensed · free for all applications | Free |
As marlinfw.org lists them, read 7 Oct 2026. The maker's own page has the final word.
Getting started
- Visit the Marlin website.
- Choose the firmware configuration for the target machine and board.
- Use PlatformIO with Auto Build Marlin to build and upload the firmware, or Arduino IDE for supported targets.
- Install the firmware using the options for the selected board, features, and firmware version.
- Connect host software such as OctoPrint if remote monitoring is needed.
Verdict
Choose Marlin if you need free, configurable firmware for a supported 3D printer, CNC machine, or laser engraver. Its motion controls, safety functions, and standalone operation are useful reasons to consider it. Look elsewhere if you need firmware that does not require configuration for the target machine and board.
Questions
How much does Marlin cost?
Marlin is free under the GPLv3 license for all applications.
Is Marlin open source?
Yes. Marlin is licensed under GPLv3.
What platforms does Marlin support?
Marlin is self-hosted and runs on a printer’s mainboard. It supports microcontrollers from 8-bit Atmel AVR boards to 32-bit ARM boards.
Can Marlin run without host software?
Yes. It can run standalone. A host such as OctoPrint can be connected for remote monitoring.
What software can build and upload Marlin?
The project recommends PlatformIO with Auto Build Marlin. Many targets can also be built with Arduino IDE.
Who maintains Marlin?
The maker community owns and maintains the project.
Facts from Marlin's own pages
- Build tools
- The site recommends PlatformIO with Auto Build Marlin for building and uploading firmware, and says many targets can also be built with Arduino IDE. · marlinfw.org, 7 Oct 2026
- Configuration
- Marlin is configured for the target machine and board, and installation options vary by board, features, and firmware version. · marlinfw.org, 7 Oct 2026
- Founded
- 2011 · marlinfw.org, 28 Sept 2026
- Hardware
- Marlin supports microcontrollers from 8-bit Atmel AVR boards to 32-bit ARM boards. · marlinfw.org, 7 Oct 2026
- Host integrations
- The documentation lists OctoPrint, Pronterface, Repetier Host, and Cura as host software options. · marlinfw.org, 7 Oct 2026
- License
- Marlin is licensed under GPLv3 and is free for all applications. · marlinfw.org, 7 Oct 2026
- Machine control
- Marlin runs as a self-contained application on a printer’s mainboard and coordinates heaters, steppers, sensors, lights, displays, and buttons. · marlinfw.org, 7 Oct 2026
- Maker
- The site says Marlin is owned and maintained by the maker community. · marlinfw.org, 7 Oct 2026
- Motion features
- Highlighted features include input shaping, linear advance, fixed-time motion, and automatic bed leveling. · marlinfw.org, 7 Oct 2026
- Other machines
- Marlin can also drive CNC machines and laser engravers. · marlinfw.org, 7 Oct 2026
- Product
- Marlin is open source firmware for the RepRap family of 3D printers. · marlinfw.org, 7 Oct 2026
- Safety features
- The site lists thermal protection, power-loss recovery, and filament-runout handling among Marlin’s safety features. · marlinfw.org, 7 Oct 2026
- Security controls
- When PASSWORD_FEATURE is enabled, Marlin supports locking the machine with a numeric passcode. · marlinfw.org, 7 Oct 2026
- Standalone operation
- Marlin can run standalone, and the site says a host such as OctoPrint can be connected for remote monitoring. · marlinfw.org, 7 Oct 2026
- Support
- The project lists its Discord community as a place for realtime help from users and developers. · marlinfw.org, 7 Oct 2026
Where Marlin stands on Freedom251
- 3D Printing Software#26 of 35