Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
Alternatives To Marlin
Project NameStarsDownloadsRepos Using ThisPackages Using ThisMost Recent CommitTotal ReleasesLatest ReleaseOpen IssuesLicenseLanguage
15 hours ago763gpl-3.0C++
Marlin is an optimized firmware for RepRap 3D printers based on the Arduino platform. Many commercial 3D printers come with Marlin installed. Check with your vendor if you need source code for your specific machine.
Prusa Firmware1,870
7 hours ago652gpl-3.0C++
Firmware for Original Prusa i3 3D printer by PrusaResearch
4 months ago17gpl-3.0C++
FW for ESP8266/ESP8285/ESP32 used with 3D printer
Repetier Firmware759
a year ago320HTML
Firmware for Arduino based RepRap 3D printer.
10 years ago9C++
Firmware for RepRap printers and similar devices
Adafruit Thermal Printer Library298
4 months ago8C++
Arduino Library for Small Thermal Printers
Arduino Gameboy Printer Emulator275
11 days ago1gpl-3.0C++
Code to emulate a gameboy printer via the gameboy link cable
a year ago26C++
Print wirelessly from Cura, PrusaSlicer or Slic3r to your 3D printer connected to an ESP8266 (in the future also ESP32) module
6 months ago24gpl-3.0C++
ADVi3++, an alternative and better firmware for Wanhao i3 Plus printers and clones. Fork of Marlin Firmware.
3 years ago119gpl-3.0G-code
MK4duo Firmware Printers 3D for Arduino and Arduino due
Alternatives To Marlin
Select To Compare

Alternative Project Comparisons

MarlinFirmware's logo

Marlin 3D Printer Firmware

GPL-V3.0 License Contributors Last Release Date CI Status GitHub Sponsors
Follow MarlinFirmware on Mastodon

Additional documentation can be found at the Marlin Home Page. Please test this firmware and let us know if it misbehaves in any way. Volunteers are standing by!

Marlin 2.1 Bugfix Branch

Not for production use. Use with caution!

Marlin 2.1 takes this popular RepRap firmware to the next level by adding support for much faster 32-bit and ARM-based boards while improving support for 8-bit AVR boards. Read about Marlin's decision to use a "Hardware Abstraction Layer" below.

This branch is for patches to the latest 2.1.x release version. Periodically this branch will form the basis for the next minor 2.1.x release.

Download earlier versions of Marlin on the Releases page.

Example Configurations

Before you can build Marlin for your machine you'll need a configuration for your specific hardware. Upon request, your vendor will be happy to provide you with the complete source code and configurations for your machine, but you'll need to get updated configuration files if you want to install a newer version of Marlin. Fortunately, Marlin users have contributed dozens of tested configurations to get you started. Visit the MarlinFirmware/Configurations repository to find the right configuration for your hardware.

Building Marlin 2.1

To build and upload Marlin you will use one of these tools:

Marlin is optimized to build with the PlatformIO IDE extension for Visual Studio Code. You can still build Marlin with Arduino IDE, and we hope to improve the Arduino build experience, but at this time PlatformIO is the better choice.

Hardware Abstraction Layer (HAL)

Marlin includes an abstraction layer to provide a common API for all the platforms it targets. This allows Marlin code to address the details of motion and user interface tasks at the lowest and highest levels with no system overhead, tying all events directly to the hardware clock.

Every new HAL opens up a world of hardware. At this time we need HALs for RP2040 and the Duet3D family of boards. A HAL that wraps an RTOS is an interesting concept that could be explored. Did you know that Marlin includes a Simulator that can run on Windows, macOS, and Linux? Join the Discord to help move these sub-projects forward!

8-Bit AVR Boards

A core tenet of this project is to keep supporting 8-bit AVR boards while also maintaining a single codebase that applies equally to all machines. We want casual hobbyists to benefit from the community's innovations as much as possible just as much as those with fancier machines. Plus, those old AVR-based machines are often the best for your testing and feedback!

Supported Platforms

Platform MCU Example Boards
Arduino AVR ATmega RAMPS, Melzi, RAMBo
Teensy++ 2.0 AT90USB1286 Printrboard
LPC1768 ARM Cortex-M3 MKS SBASE, Re-ARM, Selena Compact
LPC1769 ARM Cortex-M3 Smoothieboard, Azteeg X5 mini, TH3D EZBoard
STM32F103 ARM Cortex-M3 Malyan M200, GTM32 Pro, MKS Robin, BTT SKR Mini
STM32F401 ARM Cortex-M4 ARMED, Rumba32, SKR Pro, Lerdge, FYSETC S6, Artillery Ruby
STM32F7x6 ARM Cortex-M7 The Borg, RemRam V1
STM32G0B1RET6 ARM Cortex-M0+ BigTreeTech SKR mini E3 V3.0
STM32H743xIT6 ARM Cortex-M7 BigTreeTech SKR V3.0, SKR EZ V3.0, SKR SE BX V2.0/V3.0
SAMD51P20A ARM Cortex-M4 Adafruit Grand Central M4
Teensy 3.5 ARM Cortex-M4
Teensy 3.6 ARM Cortex-M4
Teensy 4.0 ARM Cortex-M7
Teensy 4.1 ARM Cortex-M7
Linux Native x86/ARM/etc. Raspberry Pi

Submitting Patches

Proposed patches should be submitted as a Pull Request against the (bugfix-2.1.x) branch.

  • This branch is for fixing bugs and integrating any new features for the duration of the Marlin 2.1.x life-cycle.
  • Follow the Coding Standards to gain points with the maintainers.
  • Please submit Feature Requests and Bug Reports to the Issue Queue. Support resources are also listed there.
  • Whenever you add new features, be sure to add tests to buildroot/tests and then run your tests locally, if possible.
    • It's optional: Running all the tests on Windows might take a long time, and they will run anyway on GitHub.
    • If you're running the tests on Linux (or on WSL with the code on a Linux volume) the speed is much faster.
    • You can use make tests-all-local or make tests-single-local TEST_TARGET=....
    • If you prefer Docker you can use make tests-all-local-docker or make tests-all-local-docker TEST_TARGET=....

Marlin Support

The Issue Queue is reserved for Bug Reports and Feature Requests. To get help with configuration and troubleshooting, please use the following resources:


Marlin is constantly improving thanks to a huge number of contributors from all over the world bringing their specialties and talents. Huge thanks are due to all the contributors who regularly patch up bugs, help direct traffic, and basically keep Marlin from falling apart. Marlin's continued existence would not be possible without them.


Regular users can open and close their own issues, but only the administrators can do project-related things like add labels, merge changes, set milestones, and kick trolls. The current Marlin admin team consists of:

Project Maintainer

Scott Lahteine @thinkyhead Donate

Roxanne Neufeld @Roxy-3D

Keith Bennett @thisiskeithb Donate

Jason Smith @sjasonsmith

Victor Oliveira @rhapsodyv

Chris Pepper @p3p

Peter Ellens @ellensp Donate

Bob Kuhn @Bob-the-Kuhn

Erik van der Zalm @ErikZalm Donate


Marlin is published under the GPL license because we believe in open development. The GPL comes with both rights and obligations. Whether you use Marlin firmware as the driver for your open or closed-source product, you must keep Marlin open, and you must provide your compatible Marlin source code to end users upon request. The most straightforward way to comply with the Marlin license is to make a fork of Marlin on Github, perform your modifications, and direct users to your modified fork.

While we can't prevent the use of this code in products (3D printers, CNC, etc.) that are closed source or crippled by a patent, we would prefer that you choose another firmware or, better yet, make your own.

Popular Arduino Projects
Popular Printer Projects
Popular Hardware Categories
Related Searches

Get A Weekly Email With Trending Projects For These Categories
No Spam. Unsubscribe easily at any time.
C Plus Plus
3d Printing