The aim of this project is to provide clear and concise documentation for Marlin 3D printer firmware. This documentation is made open and available on Github so anyone is welcome to contribute by either completing, correcting or creating new articles. See the section below, "What We Need Most," for a current list of... what we need most.

Be safe, have fun and build all the things!

The Marlin Documentation Project is built using the following technologies:

• Ruby
• RubyGems
• Jekyll
• Github pages

To work with the documentation, first you need to make a Fork of this repository in your own Github account, then locally clone your MarlinDocumentation fork. You should do all work within your own fork before submitting it to us. You can download the GitHub Desktop app and use Github's "Open in Desktop" option, or from your own desktop open a terminal/cmd window and do:

• cd C:\ (for example)
• git clone https://github.com/MarlinFirmware/MarlinDocumentation.git

This will create a local C:\MarlinDocumentation folder linked to your fork.

To add new documentation or edit existing documentation, start by creating a new branch as a copy of the 'master' branch. You can do this using the Github web interface, from within Github Desktop, or from the command line.

If your new document is about "mashed potatoes" then name the new branch accordingly:

git checkout master -b doc-mashed_potatoes

Inside the _docs folder add the new file mashed-potatoes.md and let flow all your creativity into it. When you feel your masterpiece is ready to be shared with the world, commit the changes and push them up to your fork of MarlinDocumentation, then start a new Pull Request to the upstream repository (MarlinFirmware/MarlinDocumentation). This is done most easily from within the Github Desktop app. Please read Github's documentation on managing branches and creating Pull Requests if you're not sure how to proceed.

git add mashed-potatoes.md
git commit -m "Added a new document about potatoes"
git push

This Jekyll-based site is based on the Markdown language in delicious YAML wrapper. Be careful with this format because small typos can cause Jekyll to reject the page. If you've installed Jekyll as described below, your local auto-building Jekyll server will tell you where your errors are.

Try to be neutral, concise, and straightforward. Avoid use of personal pronouns, unless avoiding them proves awkward. Provide images and give examples where needed. Check your spelling, grammar, and punctuation.

1. Transfer documents from the old Marlin wiki into the new site.
2. Transfer descriptions of the options in Configuration.h and Configuration_adv.h to the new system.
3. Create "Getting Started" guides to ease the Marlin learning curve for new users.
4. Document all supported GCodes with notes specific to Marlin.

If you'd like to be able to preview your contributions before submitting them, you'll need to install Jekyll on your system. Instructions are given below. As this is a non-trivial process, we recommend reading one of the following tutorials for a quick start with Jekyll:

• Jekyll running on Windows
• Jekyll running on Linux, Unix, or Mac OS X

1. Get Ruby for Windows (32 bit, 64bit), execute the installer and go through the steps of the installation, make sure to check the “Add Ruby executables to your PATH” box.
2. Get Ruby Devkit (32 bit, 64bit), the download is a self-extracting archive. When you execute the file, it’ll ask you for a destination for the files. Enter a path that has no spaces in it. We recommend something simple, like C:\RubyDevKit\ . Click Extract and wait until the process is finished.
3. Open your favorite command line tool and do:

• cd C:\RubyDevKit
• ruby dk.rb init
• ruby dk.rb install
• gem install bundler

Ruby 2.3 or newer is required to use Jekyll, but macOS 10.12 only includes Ruby 2.2. For macOS 10.12 and earlier the custom rbenv install described below is required. Even when the OS comes with Ruby 2.3, we still find it easier to use rbenv and ruby-build to make a self-managed Ruby install.

To install rbenv and ruby-build we recommend using one of the popular package managers, Homebrew or MacPorts. (You can also download and install these tools manually.)

Important: Don't install Ruby 2.3 itself using Homebrew/MacPorts/etc., as this leads down a twisty rabbit hole. Either trust the built-in Ruby 2.3 or newer installation or use rbenv to do everything. Note that rbenv is incompatible with rvm, so if you ever installed rvm before you'll need to remove it before proceeding.

Once you have rbenv and ruby-build installed, follow the instructions on the rbenv project page to:

• install a local version of Ruby (2.3 or newer),
• modify your .bash_profile with code to set your Ruby environment, and
• create a local shims folder with $PATH pointing to your Ruby.

It sounds ugly, but hopefully the instructions on the rbenv project page are clear enough to get you that far. You'll be using rbenv from now on to install and manage local Ruby environments.

With your Ruby environment set up and ready to go, you can now install the bundler Ruby gem with:

• gem install bundler

Under Jekyll we use YAML, Markdown, Liquid, and HTML to fill out the site content and layout. A _config.yml file defines the site structure using "collections" that correspond to site sub-folders. The site is "compiled" to produce a static HTML and Javascript file structure. The most important folders are:

• _layouts contains the general layouts (aka page templates).
• _includes has partial layouts included by others.
• _meta is where we keep top-level page descriptions.
• Site sub-pages: _basics, _configuration, _development, _features, _gcode, _hardware

Now that you have Ruby installed, you'll be able to use Jekyll to preview your changes exactly as they will appear on the final site. Just open a terminal/cmd window, use chdir or cd to change the working path to your local copy of the repository, and execute the following commands:

bundle install --path vendor/bundle
bundle exec jekyll serve --watch --incremental

You'll only need to execute the bundle install command once to install all the required Ruby gems, including Jekyll itself. If you get errors at this stage, you may need to update your Ruby installation, fix your Ruby environment, or resolve dependencies between the Ruby gems.

With the serve option, Jekyll watches the local files and on every save triggers an automatic build of the site. It also runs a mini-webserver at http://localhost:4000/ so the documentation can be previewed in the browser right on your own computer.

We now use GitHub Actions to publish to the gh-pages branch whenever the master branch is updated, so no extra steps are needed to publish the site.

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.