Additional documentation can be found at the [Marlin Home Page](//marlinfw.org/).
Please test this firmware and let us know if it misbehaves in any way. Volunteers are standing by!
## Marlin 2.1
Marlin 2.1 continues to support both 32-bit ARM and 8-bit AVR boards while adding support for up to 9 coordinated axes and to up to 8 extruders.
Download earlier versions of Marlin on the [Releases page](//github.com/MarlinFirmware/Marlin/releases).
## 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](//github.com/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:
- The free [Visual Studio Code](//code.visualstudio.com/download) using the [Auto Build Marlin](//marlinfw.org/docs/basics/auto_build_marlin.html) extension.
- The free [Arduino IDE](//www.arduino.cc/en/main/software) : See [Building Marlin with Arduino](//marlinfw.org/docs/basics/install_arduino.html)
- You can also use VSCode with devcontainer : See [Installing Marlin (VSCode devcontainer)](http://marlinfw.org/docs/basics/install_devcontainer_vscode.html).
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.
## 8-Bit AVR Boards
We intend to continue supporting 8-bit AVR boards in perpetuity, maintaining a single codebase that can apply to all machines. We want casual hobbyists and tinkerers and owners of older machines to benefit from the community's innovations just as much as those with fancier machines. Plus, those old AVR-based machines are often the best for your testing and feedback!
## 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!
### Supported Platforms
Platform|MCU|Example Boards
--------|---|-------
[Arduino AVR](//www.arduino.cc/)|ATmega|RAMPS, Melzi, RAMBo
[Teensy++ 2.0](//www.microchip.com/en-us/product/AT90USB1286)|AT90USB1286|Printrboard
[Arduino Due](//www.arduino.cc/en/Guide/ArduinoDue)|SAM3X8E|RAMPS-FD, RADDS, RAMPS4DUE
[ESP32](//github.com/espressif/arduino-esp32)|ESP32|FYSETC E4, E4d@BOX, MRR
[LPC1768](//www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc1700-cortex-m3/512-kb-flash-64-kb-sram-ethernet-usb-lqfp100-package:LPC1768FBD100)|ARM® Cortex-M3|MKS SBASE, Re-ARM, Selena Compact
[LPC1769](//www.nxp.com/products/processors-and-microcontrollers/arm-microcontrollers/general-purpose-mcus/lpc1700-cortex-m3/512-kb-flash-64-kb-sram-ethernet-usb-lqfp100-package:LPC1769FBD100)|ARM® Cortex-M3|Smoothieboard, Azteeg X5 mini, TH3D EZBoard
[STM32F103](//www.st.com/en/microcontrollers-microprocessors/stm32f103.html)|ARM® Cortex-M3|Malyan M200, GTM32 Pro, MKS Robin, BTT SKR Mini
[STM32F401](//www.st.com/en/microcontrollers-microprocessors/stm32f401.html)|ARM® Cortex-M4|ARMED, Rumba32, SKR Pro, Lerdge, FYSETC S6, Artillery Ruby
[STM32F7x6](//www.st.com/en/microcontrollers-microprocessors/stm32f7x6.html)|ARM® Cortex-M7|The Borg, RemRam V1
[STM32G0B1RET6](//www.st.com/en/microcontrollers-microprocessors/stm32g0x1.html)|ARM® Cortex-M0+|BigTreeTech SKR mini E3 V3.0
[STM32H743xIT6](//www.st.com/en/microcontrollers-microprocessors/stm32h743-753.html)|ARM® Cortex-M7|BigTreeTech SKR V3.0, SKR EZ V3.0, SKR SE BX V2.0/V3.0
[SAMD51P20A](//www.adafruit.com/product/4064)|ARM® Cortex-M4|Adafruit Grand Central M4
[Teensy 3.5](//www.pjrc.com/store/teensy35.html)|ARM® Cortex-M4|
[Teensy 3.6](//www.pjrc.com/store/teensy36.html)|ARM® Cortex-M4|
[Teensy 4.0](//www.pjrc.com/store/teensy40.html)|ARM® Cortex-M7|
[Teensy 4.1](//www.pjrc.com/store/teensy41.html)|ARM® Cortex-M7|
Linux Native|x86/ARM/etc.|Raspberry Pi
[All supported boards](//marlinfw.org/docs/hardware/boards.html#boards-list)|All platforms|All boards
## Marlin Support
The Issue Queue is reserved for Bug Reports and Feature Requests. Please use the following resources for help with configuration and troubleshooting:
- [Marlin Documentation](//marlinfw.org) - Official Marlin documentation
- [Marlin Discord](//discord.com/servers/marlin-firmware-461605380783472640) - Discuss issues with Marlin users and developers
- Facebook Group ["Marlin Firmware"](//www.facebook.com/groups/1049718498464482/)
- RepRap.org [Marlin Forum](//forums.reprap.org/list.php?415)
- Facebook Group ["Marlin Firmware for 3D Printers"](//www.facebook.com/groups/3Dtechtalk/)
- [Marlin Configuration](//www.youtube.com/results?search_query=marlin+configuration) on YouTube
## Contributing Patches
You can contribute patches by submitting a Pull Request to the ([bugfix-2.1.x](//github.com/MarlinFirmware/Marlin/tree/bugfix-2.1.x)) branch.
- We use branches named with a "bugfix" or "dev" prefix to fix bugs and integrate new features.
- Follow the [Coding Standards](//marlinfw.org/docs/development/coding_standards.html) to gain points with the maintainers.
- Please submit Feature Requests and Bug Reports to the [Issue Queue](//github.com/MarlinFirmware/Marlin/issues/new/choose). See above for user support.
- Whenever you add new features, be sure to add one or more build tests to `buildroot/tests`. Any tests added to a PR will be run within that PR on GitHub servers as soon as they are pushed. To minimize iteration be sure to run your new tests locally, if possible.
- Local build tests:
- All: `make tests-config-all-local`
- Single: `make tests-config-single-local TEST_TARGET=...`
- Local build tests in Docker:
- All: `make tests-config-all-local-docker`
- Single: `make tests-config-all-local-docker TEST_TARGET=...`
- To run all unit test suites:
- Using PIO: `platformio run -t test-marlin`
- Using Make: `make unit-test-all-local`
- Using Docker + make: `maker unit-test-all-local-docker`
- To run a single unit test suite:
- Using PIO: `platformio run -t marlin_`
- Using make: `make unit-test-single-local TEST_TARGET=`
- Using Docker + make: `maker unit-test-single-local-docker TEST_TARGET=`
- If your feature can be unit tested, add one or more unit tests. For more information see our documentation on [Unit Tests](test).
## Contributors
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](//github.com/MarlinFirmware/Marlin/graphs/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.
Marlin Firmware original logo design by Ahmet Cem TURAN [@ahmetcemturan](//github.com/ahmetcemturan).
## Project Leadership
Name|Role|Link|Donate
----|----|----|----
🇺🇸 Scott Lahteine|Project Lead|[[@thinkyhead](//github.com/thinkyhead)]|[💸 Donate](//marlinfw.org/docs/development/contributing.html#donate)
🇺🇸 Roxanne Neufeld|Admin|[[@Roxy-3D](//github.com/Roxy-3D)]|
🇺🇸 Keith Bennett|Admin|[[@thisiskeithb](//github.com/thisiskeithb)]|[💸 Donate](//github.com/sponsors/thisiskeithb)
🇺🇸 Jason Smith|Admin|[[@sjasonsmith](//github.com/sjasonsmith)]|
🇧🇷 Victor Oliveira|Admin|[[@rhapsodyv](//github.com/rhapsodyv)]|
🇬🇧 Chris Pepper|Admin|[[@p3p](//github.com/p3p)]|
🇳🇿 Peter Ellens|Admin|[[@ellensp](//github.com/ellensp)]|[💸 Donate](//ko-fi.com/ellensp)
🇺🇸 Bob Kuhn|Admin|[[@Bob-the-Kuhn](//github.com/Bob-the-Kuhn)]|
🇳🇱 Erik van der Zalm|Founder|[[@ErikZalm](//github.com/ErikZalm)]|
## Star History
## License
Marlin is published under the [GPL license](/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.
