diff --git a/.github/workflows/build_all.yml b/.github/workflows/build_all.yml
index 49e6f58fd6..fd7d764c45 100644
--- a/.github/workflows/build_all.yml
+++ b/.github/workflows/build_all.yml
@@ -165,6 +165,30 @@ jobs:
       os: ${{ vars.SELF_HOSTED && 'orca-macos-arm64' || 'macos-14' }}
       artifact: ${{ github.sha }}-tests-macos-arm64
       test-dir: build/arm64/tests
+  # Slice a two-colour cube through every shipped printer with this PR's engine
+  # so all custom g-code (change_filament_gcode, machine start/end, etc.) is
+  # expanded - catches slicing regressions the static profile checks and unit
+  # tests can't see. Profile-only PRs are covered by check_profiles.yml (nightly
+  # binary); this covers src/engine PRs with the PR-built binary. Runs in
+  # parallel off build_linux's artifact so it doesn't lengthen the build leg.
+  slice_check_linux:
+    name: Slice check (Linux x86_64)
+    needs: build_linux
+    if: ${{ !cancelled() && success() }}
+    runs-on: ${{ vars.SELF_HOSTED && 'orca-lnx-server' || 'ubuntu-24.04' }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+      - name: Download profile validator
+        uses: actions/download-artifact@v8
+        with:
+          name: ${{ github.sha }}-profile-validator-linux-x86_64
+          path: validator-bin
+      - name: Validate slice (expand custom g-code)
+        timeout-minutes: 60
+        run: |
+          chmod +x validator-bin/OrcaSlicer_profile_validator
+          ./validator-bin/OrcaSlicer_profile_validator -p "${{ github.workspace }}/resources/profiles" -s -l 2
   publish_test_results:
     name: Publish Test Results
     needs: [unit_tests_linux_x86_64, unit_tests_linux_aarch64, unit_tests_windows_x64, unit_tests_windows_arm64, unit_tests_macos_arm64]
diff --git a/.github/workflows/build_orca.yml b/.github/workflows/build_orca.yml
index 21c65283a9..273c5074ce 100644
--- a/.github/workflows/build_orca.yml
+++ b/.github/workflows/build_orca.yml
@@ -508,6 +508,20 @@ jobs:
           retention-days: 5
           if-no-files-found: error
 
+        # Ship the freshly-built validator so the parallel slice_check_linux job
+        # (build_all.yml) can slice-sweep the shipped profiles with this PR's
+        # engine. Stable sha-based name mirrors the tests artifact above so the
+        # downstream job downloads it by exact name.
+      - name: Upload profile validator (for slice check)
+        if: runner.os == 'Linux' && inputs.arch != 'aarch64'
+        uses: actions/upload-artifact@v7
+        with:
+          name: ${{ github.sha }}-profile-validator-linux-x86_64
+          overwrite: true
+          path: ./build/src/Release/OrcaSlicer_profile_validator
+          retention-days: 5
+          if-no-files-found: error
+
       - name: Run external slicer regression tests
         if: runner.os == 'Linux' && inputs.arch != 'aarch64'
         timeout-minutes: 20