Marlin 2.0 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.
To build Marlin 2.0 you'll need [Arduino IDE 1.8.8 or newer](https://www.arduino.cc/en/main/software) or [PlatformIO](http://docs.platformio.org/en/latest/ide.html#platformio-ide). We've posted detailed instructions on [Building Marlin with Arduino](http://marlinfw.org/docs/basics/install_arduino.html) and [Building Marlin with PlatformIO for ReArm](http://marlinfw.org/docs/basics/install_rearm.html) (which applies well to other 32-bit boards).
Marlin 2.0 introduces a layer of abstraction so that all the existing high-level code can be built for 32-bit platforms while still retaining full 8-bit AVR compatibility. Retaining AVR compatibility and a single code-base is important to us, because we want to make sure that features and patches get as much testing and attention as possible, and that all platforms always benefit from the latest improvements.
Proposed patches should be submitted as a Pull Request against the ([bugfix-2.0.x](https://github.com/MarlinFirmware/Marlin/tree/bugfix-2.0.x)) branch.
- Scott Lahteine [[@thinkyhead](https://github.com/thinkyhead)] - USA [](https://flattr.com/submit/auto?user_id=thinkhead&url=https://github.com/MarlinFirmware/Marlin&title=Marlin&language=&tags=github&category=software)
- Roxanne Neufeld [[@Roxy-3D](https://github.com/Roxy-3D)] - USA
- Bob Kuhn [[@Bob-the-Kuhn](https://github.com/Bob-the-Kuhn)] - USA
- Chris Pepper [[@p3p](https://github.com/p3p)] - UK
- Erik van der Zalm [[@ErikZalm](https://github.com/ErikZalm)] - Netherlands [](https://flattr.com/submit/auto?user_id=ErikZalm&url=https://github.com/MarlinFirmware/Marlin&title=Marlin&language=&tags=github&category=software)
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.
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.
