Add Marlin firmware. Has initial configuration for CoreXY and 1 servo.

Update CAD file with improved clearances for Pilot G2 cartridge clearances after first print.

Marlin Firmware/.github/workflows/bump-date.yml

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+#
+# bump-date.yml
+# Bump the distribution date once per day
+#
+
+name: Bump Distribution Date
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+jobs:
+  bump_date:
+    name: Bump Distribution Date
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: Check out bugfix-2.0.x
+      uses: actions/checkout@v2
+      with:
+        ref: bugfix-2.0.x
+
+    - name: Bump Distribution Date
+      run: |
+        # Inline Bump Script
+        DIST=$( date +"%Y-%m-%d" )
+        eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/src/inc/Version.h" && \
+        git config user.name "${GITHUB_ACTOR}" && \
+        git config user.email "${GITHUB_ACTOR}@users.noreply.github.com" && \
+        git add . && \
+        git commit -m "[cron] Bump distribution date ($DIST)" && \
+        git push

Marlin Firmware/.github/workflows/check-pr.yml

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+#
+# check-pr.yml
+# Close PRs directed at release branches
+#
+
+name: PR Bad Target
+
+on:
+  pull_request:
+    branches:
+    - 1.0.x
+    - 1.1.x
+    - 2.0.x
+
+jobs:
+  bad_target:
+    name: PR Bad Target
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: superbrothers/close-pull-request@v3
+      with:
+        comment: >
+          Thanks for your contribution! Unfortunately we can't accept PRs directed at release branches. We make patches to the bugfix branches and only later do we push them out as releases.
+
+          Please redo this PR starting with the `bugfix-2.0.x` branch and be careful to target `bugfix-2.0.x` when resubmitting the PR.
+
+          It may help to set your fork's default branch to `bugfix-2.0.x`.
+
+          See [this page](http://marlinfw.org/docs/development/getting_started_pull_requests.html) for full instructions.

Marlin Firmware/.github/workflows/clean-closed.yml

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+#
+# clean-closed.yml
+# Remove obsolete labels when an Issue or PR is closed
+#
+
+name: Clean Closed
+
+on:
+  pull_request:
+    types: [closed]
+  issues:
+    types: [closed]
+
+jobs:
+  remove_label:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        label:
+          - "S: Don't Merge"
+          - "S: Hold for 2.1"
+          - "S: Please Merge"
+          - "S: Please Test"
+          - "help wanted"
+          - "Needs: Discussion"
+          - "Needs: Documentation"
+          - "Needs: More Data"
+          - "Needs: Patch"
+          - "Needs: Testing"
+          - "Needs: Work"
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Remove Labels
+        uses: actions-ecosystem/action-remove-labels@v1
+        with:
+          github_token: ${{ github.token }}
+          labels: ${{ matrix.label }}

Marlin Firmware/.github/workflows/close-stale.yml

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+#
+# close-stale.yml
+# Close open issues after a period of inactivity
+#
+
+name: Close Stale Issues
+
+on:
+  schedule:
+  - cron: "22 1 * * *"
+
+jobs:
+  stale:
+    name: Close Stale Issues
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v3
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue has had no activity in the last 60 days. Please add a reply if you want to keep this issue active, otherwise it will be automatically closed within 10 days.'
+        days-before-stale: 60
+        days-before-close: 10
+        stale-issue-label: 'stale-closing-soon'
+        exempt-all-assignees: true
+        exempt-issue-labels: 'Bug: Confirmed !,T: Feature Request,Needs: Discussion,Needs: Documentation,Needs: More Data,Needs: Patch,Needs: Work,Needs: Testing,help wanted,no-locking'

Marlin Firmware/.github/workflows/lock-closed.yml

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+#
+# lock-closed.yml
+# Lock closed issues after a period of inactivity
+#
+
+name: Lock Closed Issues
+
+on:
+  schedule:
+    - cron: '0 1/13 * * *'
+
+jobs:
+  lock:
+    name: Lock Closed Issues
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: dessant/lock-threads@v2
+      with:
+        github-token: ${{ github.token }}
+        process-only: 'issues'
+        issue-lock-inactive-days: '60'
+        issue-exclude-created-before: '2017-07-01T00:00:00Z'
+        issue-exclude-labels: 'no-locking'
+        issue-lock-labels: ''
+        issue-lock-comment: >
+          This issue has been automatically locked since there
+          has not been any recent activity after it was closed.
+          Please open a new issue for related bugs.
+        issue-lock-reason: ''

Marlin Firmware/.github/workflows/test-builds.yml

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+#
+# test-builds.yml
+# Do test builds to catch compile errors
+#
+
+name: CI
+
+on:
+  pull_request:
+    branches:
+    - bugfix-2.0.x
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - '**/*.md'
+  push:
+    branches:
+    - bugfix-2.0.x
+    paths-ignore:
+    - config/**
+    - data/**
+    - docs/**
+    - '**/*.md'
+
+jobs:
+  test_builds:
+    name: Run All Tests
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        test-platform:
+        # Base Environments
+
+        - DUE
+        - DUE_archim
+        - esp32
+        - linux_native
+        - mega2560
+        - at90usb1286_dfu
+        - teensy31
+        - teensy35
+        - teensy41
+        - SAMD51_grandcentral_m4
+
+        # Extended AVR Environments
+
+        - FYSETC_F6
+        - mega1280
+        - rambo
+        - sanguino1284p
+        - sanguino644p
+
+        # STM32F1 (Maple) Environments
+
+        #- STM32F103RC_btt_maple
+        - STM32F103RC_btt_USB_maple
+        - STM32F103RC_fysetc
+        - STM32F103RC_meeb
+        - jgaurora_a5s_a1
+        - STM32F103VE_longer
+        #- mks_robin_maple
+        - mks_robin_lite
+        - mks_robin_pro
+        #- mks_robin_nano35_maple
+        #- STM32F103RET6_creality_maple
+
+        # STM32 (ST) Environments
+
+        - STM32F103RC_btt
+        #- STM32F103RC_btt_USB
+        - STM32F103RE_btt
+        - STM32F103RE_btt_USB
+        - STM32F103RET6_creality
+        - STM32F407VE_black
+        - STM32F401VE_STEVAL
+        - BIGTREE_BTT002
+        - BIGTREE_SKR_PRO
+        - BIGTREE_GTR_V1_0
+        - mks_robin
+        - ARMED
+        - FYSETC_S6
+        - STM32F070CB_malyan
+        - STM32F070RB_malyan
+        - malyan_M300
+        - FLYF407ZG
+        - rumba32
+        - LERDGEX
+        - LERDGEK
+        - mks_robin_nano35
+        - NUCLEO_F767ZI
+        - REMRAM_V1
+        - BTT_SKR_SE_BX
+        - chitu_f103
+
+        # Put lengthy tests last
+
+        - LPC1768
+        - LPC1769
+
+        # Non-working environment tests
+        #- at90usb1286_cdc
+        #- STM32F103CB_malyan
+        #- STM32F103RE
+        #- mks_robin_mini
+
+    steps:
+
+    - name: Check out the PR
+      uses: actions/checkout@v2
+
+    - name: Cache pip
+      uses: actions/cache@v2
+      with:
+        path: ~/.cache/pip
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
+        restore-keys: |
+          ${{ runner.os }}-pip-
+
+    - name: Cache PlatformIO
+      uses: actions/cache@v2
+      with:
+        path: ~/.platformio
+        key: ${{ runner.os }}-${{ hashFiles('**/lockfiles') }}
+
+    - name: Select Python 3.7
+      uses: actions/setup-python@v2
+      with:
+        python-version: '3.7' # Version range or exact version of a Python version to use, using semvers version range syntax.
+        architecture: 'x64' # optional x64 or x86. Defaults to x64 if not specified
+
+    - name: Install PlatformIO
+      run: |
+        pip install -U https://github.com/platformio/platformio-core/archive/develop.zip
+        platformio update
+
+    - name: Run ${{ matrix.test-platform }} Tests
+      run: |
+        make tests-single-ci TEST_TARGET=${{ matrix.test-platform }}

Marlin Firmware/.github/workflows/unlock-reopened.yml

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+#
+# unlock-reopened.yml
+# Unlock an issue whenever it is re-opened
+#
+
+name: "Unlock reopened issue"
+
+on:
+  issues:
+    types: [reopened]
+
+jobs:
+  unlock:
+    name: Unlock Reopened
+    if: github.repository == 'MarlinFirmware/Marlin'
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: OSDKDev/unlock-issues@v1.1
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"