diff --git a/.github/workflows/build-lib3mf.yml b/.github/workflows/build-lib3mf.yml
new file mode 100644
index 0000000000..a472201d26
--- /dev/null
+++ b/.github/workflows/build-lib3mf.yml
@@ -0,0 +1,172 @@
+# SPDX-FileCopyrightText: 2026 The RISE Project
+# SPDX-License-Identifier: MIT
+---
+# Based on: https://github.com/3MFConsortium/lib3mf_python/blob/v2.5.0/.github/workflows/python-package.yml
+name: Build lib3mf wheels (riscv64)
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version glob to (re)build; empty builds every version of docs/packages/lib3mf.yaml not released yet'
+        required: false
+        default: ''
+  pull_request:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-lib3mf.yml'
+      - 'docs/packages/lib3mf.yaml'
+  push:
+    branches: [main]
+    paths:
+      - '.github/workflows/build-lib3mf.yml'
+      - 'docs/packages/lib3mf.yaml'
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read  # to fetch code (actions/checkout)
+
+env:
+  MANYLINUX_RISCV64_IMAGE: quay.io/pypa/manylinux_2_39_riscv64
+
+jobs:
+  setup:
+    uses: $/.github/workflows/_setup.yml
+    with:
+      package: lib3mf
+      version: ${{ inputs.version }}
+
+  build_wheels:
+    needs: [setup]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    name: Build lib3mf ${{ matrix.version }} py3-none-manylinux_riscv64
+    runs-on: ubuntu-24.04-riscv
+    timeout-minutes: 360
+
+    env:
+      LIB3MF_VERSION: ${{ matrix.version }}
+
+    steps:
+      - name: Checkout lib3mf_python v${{ env.LIB3MF_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: 3MFConsortium/lib3mf_python
+          ref: v${{ env.LIB3MF_VERSION }}
+          persist-credentials: false
+
+      # lib3mf/lib3mf.so is committed to the packaging repo as an x86_64 binary,
+      # lifted by prepare_pypi_release.py out of the lib3mf_sdk_v<version>.zip
+      # release asset. That SDK is published for x86_64 Linux only, so build the
+      # library from its own sources instead (gotcha 77).
+      - name: Checkout lib3mf v${{ env.LIB3MF_VERSION }}
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          repository: 3MFConsortium/lib3mf
+          ref: v${{ env.LIB3MF_VERSION }}
+          path: lib3mf-src
+          submodules: true
+          persist-credentials: false
+
+      - name: Checkout python-wheels
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1  # v7.0.1
+        with:
+          path: python-wheels
+          persist-credentials: false
+
+      - name: Patch lib3mf_python source
+        run: git apply python-wheels/patches/lib3mf/${{ env.LIB3MF_VERSION }}/*.patch
+
+      # lib3mf.so statically links zlib, libzip and cpp-base64 and inlines
+      # fast_float, but the wheel ships only the binding's own BSD licence.
+      - name: Stage the statically linked libraries' licences
+        run: |
+          cp lib3mf-src/submodules/zlib/LICENSE LICENSE.zlib
+          cp lib3mf-src/submodules/libzip/LICENSE LICENSE.libzip
+          cp lib3mf-src/submodules/cpp-base64/LICENSE LICENSE.cpp-base64
+          cp lib3mf-src/submodules/fast_float/LICENSE-MIT LICENSE.fast_float
+
+      - name: Pull manylinux_riscv64 image
+        run: docker pull "${MANYLINUX_RISCV64_IMAGE}"
+
+      # LIB3MF_TESTS=OFF because the default target also builds the C++ test
+      # suite and the vendored libressl it links, neither of which reaches the
+      # wheel; the wheel's own tests cover the library below.
+      - name: Build lib3mf.so and the wheel
+        run: |
+          docker run --rm -v "$(pwd):/work" -w /work "${MANYLINUX_RISCV64_IMAGE}" bash -c '
+            set -euxo pipefail
+            cd /work/lib3mf-src
+            sh cmake/GenerateMake.sh -DLIB3MF_TESTS=OFF
+            cmake --build build -j"$(nproc)"
+            readelf -hd build/lib3mf.so
+            cd /work
+            install -m644 -T lib3mf-src/build/lib3mf.so lib3mf/lib3mf.so
+            export PATH=/opt/python/cp312-cp312/bin:$PATH
+            pip install -q -U setuptools wheel
+            python build_wheels.py
+            pip install -q dist/*.whl
+            cd /tmp
+            python -c "from lib3mf import get_wrapper; print(get_wrapper().GetLibraryVersion())"
+            python /work/examples/create_cube_example_complete.py
+            python - <<PYEOF
+          import lib3mf
+
+          model = lib3mf.get_wrapper().CreateModel()
+          model.QueryReader("3mf").ReadFromFile("cube.3mf")
+          meshes = model.GetMeshObjects()
+          assert meshes.MoveNext()
+          cube = meshes.GetCurrentMeshObject()
+          assert (cube.GetVertexCount(), cube.GetTriangleCount()) == (8, 12)
+          assert not meshes.MoveNext()
+          PYEOF
+            python /work/tests/lib3mf_py313_exception.py
+          '
+
+      - name: Check the wheel carries the riscv64 lib3mf.so and every licence
+        run: |
+          python3 - dist/*.whl <<'EOF'
+          import sys, zipfile
+
+          expected = {"LICENSE", "LICENSE.zlib", "LICENSE.libzip",
+                      "LICENSE.cpp-base64", "LICENSE.fast_float"}
+          for whl in sys.argv[1:]:
+              zf = zipfile.ZipFile(whl)
+              names = zf.namelist()
+              assert "lib3mf/lib3mf.so" in names, whl
+              e_machine = int.from_bytes(zf.read("lib3mf/lib3mf.so")[18:20], "little")
+              assert e_machine == 243, f"{whl}: e_machine {e_machine} is not riscv64"
+              licenses = {n.split(".dist-info/licenses/", 1)[1] for n in names
+                          if ".dist-info/licenses/" in n and not n.endswith("/")}
+              assert licenses == expected, f"{whl}: {sorted(licenses)}"
+              print(whl, "ok")
+          EOF
+
+      - uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a  # v7.0.1
+        with:
+          name: lib3mf-${{ env.LIB3MF_VERSION }}-py3-none-manylinux_riscv64
+          path: dist/*.whl
+          if-no-files-found: error
+
+  publish:
+    name: Publish lib3mf ${{ matrix.version }}
+    needs: [setup, build_wheels]
+    if: needs.setup.outputs.versions != '[]'
+    strategy:
+      fail-fast: false
+      matrix:
+        version: ${{ fromJSON(needs.setup.outputs.versions) }}
+    permissions:
+      contents: write
+      pull-requests: write
+    uses: $/.github/workflows/_publish-wheel.yml
+    secrets:
+      app-private-key: ${{ secrets.RISEPROJECT_APP_PRIVATE_KEY }}
+    with:
+      artifact-pattern: lib3mf-${{ matrix.version }}-*-manylinux_riscv64
diff --git a/docs/packages/lib3mf.yaml b/docs/packages/lib3mf.yaml
new file mode 100644
index 0000000000..9bc78917dd
--- /dev/null
+++ b/docs/packages/lib3mf.yaml
@@ -0,0 +1,5 @@
+package-name: lib3mf
+source-code: https://github.com/3MFConsortium/lib3mf_python
+license: BSD-3-Clause
+versions:
+- version: 2.5.0
diff --git a/patches/lib3mf/2.5.0/0001-Support-building-the-wheel-on-linux-riscv64.patch b/patches/lib3mf/2.5.0/0001-Support-building-the-wheel-on-linux-riscv64.patch
new file mode 100644
index 0000000000..6e36576d8a
--- /dev/null
+++ b/patches/lib3mf/2.5.0/0001-Support-building-the-wheel-on-linux-riscv64.patch
@@ -0,0 +1,65 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Ludovic Henry <git@ludovic.dev>
+Date: Mon, 21 Sep 2026 00:00:00 +0000
+Subject: [PATCH] Support building the wheel on linux riscv64
+
+The Linux wheel is a per-architecture artifact: lib3mf/lib3mf.so is a
+compiled binary and build_wheels.py forces the platform tag by hand, so
+the two hardcoded x86_64 assumptions are what stop a riscv64 host from
+producing its own wheel.
+
+setup.py's SUPPORTED_PLATFORMS gate raises before setuptools runs, and
+get_platform_tag() returns manylinux2014_x86_64 for every Linux host.
+manylinux2014 is a glibc 2.17 baseline that predates riscv64 entirely -
+the oldest manylinux profile defined for that architecture is glibc 2.39
+- so the tag has to be selected per architecture rather than shared.
+
+Nothing else in the packaging is architecture-specific, and x86_64 keeps
+the exact tag it had.
+
+Upstream-Status: To upstream [not yet submitted: the same change is only useful once 3MFConsortium/lib3mf publishes a riscv64 SDK build for prepare_pypi_release.py to pick up, so it needs a maintainer discussion rather than a drive-by PR]
+---
+ build_wheels.py | 12 +++++++++++-
+ setup.py        |  2 +-
+ 2 files changed, 12 insertions(+), 2 deletions(-)
+
+diff --git a/build_wheels.py b/build_wheels.py
+index eb80ae0..a4457ee 100644
+--- a/build_wheels.py
++++ b/build_wheels.py
+@@ -6,11 +6,21 @@ import os
+ MANIFEST_FILE = "manifest.json"
+ TEMP_MANIFEST_IN = "MANIFEST.in"
+ 
++# manylinux tag per Linux architecture: the manylinux2014 (glibc 2.17) baseline
++# predates riscv64, whose oldest manylinux profile is glibc 2.39.
++LINUX_PLATFORM_TAGS = {
++    "x86_64": "manylinux2014_x86_64",
++    "riscv64": "manylinux_2_39_riscv64",
++}
++
+ def get_platform_tag():
+     """Return the appropriate platform tag for wheel building."""
+     system = platform.system()
+     if system == "Linux":
+-        return "manylinux2014_x86_64"
++        machine = platform.machine()
++        if machine not in LINUX_PLATFORM_TAGS:
++            raise RuntimeError(f"Unsupported Linux architecture: {machine}")
++        return LINUX_PLATFORM_TAGS[machine]
+     elif system == "Windows":
+         return "win_amd64"
+     elif system == "Darwin":
+diff --git a/setup.py b/setup.py
+index 059882e..97a51c4 100644
+--- a/setup.py
++++ b/setup.py
+@@ -24,7 +24,7 @@ else:
+ 
+ # Restrict installation to only supported platforms and architectures
+ SUPPORTED_PLATFORMS = {
+-    "Linux": ["x86_64"],
++    "Linux": ["x86_64", "riscv64"],
+     "Windows": ["AMD64"],
+     "Darwin": ["x86_64", "arm64"]  # macOS universal (Intel & Apple Silicon)
+ }