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+{
+  lib,
+  stdenv,
+  fetchFromGitHub,
+  cmake,
+  pkg-config,
+  openssl,
+  zlib,
+  curl,
+  # Which slicer this build targets. Determines the OBN_CLIENT_TYPE CMake
+  # passes through, which in turn determines the expected filename/version
+  # scheme for the built plugin. Currently "orca_slicer" is the only target
+  # exercised by this flake's home-manager module, but the upstream project
+  # also builds for e.g. "bambu_studio" - see its CMakeLists.txt/Clients.cmake
+  # for the full list.
+  clientType ? "orca_slicer",
+  # The plugin ABI is versioned into the .so filename the slicer expects
+  # (libbambu_networking_<version>.so). Check yours with:
+  #   jq -r '.app.network_plugin_version // "not set"' ~/.config/OrcaSlicer/OrcaSlicer.conf
+  # and pass that here (with .99 as the 4th component - see README) if it differs.
+  obnVersion ? "02.03.00.99",
+}:
+
+let
+  # Vendored deps the upstream CMakeLists normally fetches over the network
+  # at configure time via FetchContent. We pre-fetch them as normal Nix
+  # sources and hand CMake writable copies instead (see preConfigure),
+  # so the build stays sandboxed.
+  mosquittoSrc = fetchFromGitHub {
+    owner = "eclipse";
+    repo = "mosquitto";
+    rev = "v2.1.2"; # must match OBN_MOSQUITTO_GIT_TAG in CMakeLists.txt
+    hash = "sha256-Zl55yjuzQY2fyaKs/zLaJ7a3OONKTDQPaT+DpPURdZI=";
+  };
+
+  cjsonSrc = fetchFromGitHub {
+    owner = "DaveGamble";
+    repo = "cJSON";
+    rev = "v1.7.18"; # must match OBN_CJSON_GIT_TAG in CMakeLists.txt
+    hash = "sha256-UgUWc/+Zie2QNijxKK5GFe4Ypk97EidG8nTiiHhn5Ys=";
+  };
+in
+stdenv.mkDerivation {
+  pname = "open-bamboo-networking-${clientType}";
+  version = "1.1.0";
+
+  src = fetchFromGitHub {
+    owner = "ClusterM";
+    repo = "open-bamboo-networking";
+    rev = "v1.1.0";
+    hash = "sha256-bxkOwCnlKu2fA3cEiTZq15anSwLkuJIyko19wqul6Fw=";
+  };
+
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+  ];
+  buildInputs = [
+    openssl
+    zlib
+    curl
+  ];
+
+  cmakeFlags = [
+    "-DOBN_CLIENT_TYPE=${clientType}"
+    "-DOBN_VERSION=${obnVersion}"
+    "-DOBN_BUILD_TESTS=OFF"
+    # This build never touches $HOME - see README.md for install steps.
+    "-DOBN_PATCH_CLIENT_CONF=OFF"
+    "-DFETCHCONTENT_FULLY_DISCONNECTED=ON"
+  ];
+
+  # The build patches the vendored mosquitto/cJSON sources in place
+  # (VendorMosquittoEmbedPatch.cmake writes into libcommon/CMakeLists.txt
+  # etc.), so FETCHCONTENT_SOURCE_DIR_* can't point directly at the
+  # read-only fetchFromGitHub store paths. Copy them into a writable
+  # scratch dir first and point CMake there instead.
+  preConfigure = ''
+    mkdir -p _vendor/mosquitto _vendor/cjson
+    cp -r --no-preserve=mode,ownership ${mosquittoSrc}/. _vendor/mosquitto
+    cp -r --no-preserve=mode,ownership ${cjsonSrc}/. _vendor/cjson
+    chmod -R u+w _vendor
+    cmakeFlagsArray+=(
+      "-DFETCHCONTENT_SOURCE_DIR_ECLIPSE_MOSQUITTO=$(pwd)/_vendor/mosquitto"
+      "-DFETCHCONTENT_SOURCE_DIR_CJSON=$(pwd)/_vendor/cjson"
+    )
+  '';
+
+  # `cmake --install` (run automatically by the stdenv cmake hook) produces,
+  # under $out/plugins/:
+  #   libbambu_networking_<obnVersion>.so   - LAN discovery/print/MQTT
+  #   libBambuSource.so                     - camera/live-view tunnel
+  #   liblive555.so                         - OTA-banner-check stub only,
+  #                                            see README before installing
+  postInstall = ''
+    mkdir -p $out/lib
+    ln -s $out/plugins/libbambu_networking_${obnVersion}.so \
+          $out/lib/libbambu_networking_${obnVersion}.so
+  '';
+
+  # Read this back from downstream (README examples, activation scripts)
+  # instead of repeating the version string everywhere.
+  passthru = {
+    inherit obnVersion clientType;
+  };
+
+  meta = with lib; {
+    description = "Open-source drop-in replacement for Bambu Lab slicers' proprietary bambu_networking plugin (client: ${clientType})";
+    homepage = "https://github.com/ClusterM/open-bamboo-networking";
+    license = licenses.agpl3Plus;
+    platforms = platforms.linux;
+  };
+}