diff --git a/pkgs/applications/misc/cura/lulzbot.nix b/pkgs/applications/misc/cura/lulzbot.nix
deleted file mode 100644
index f3f1972f6e6e..000000000000
--- a/pkgs/applications/misc/cura/lulzbot.nix
+++ /dev/null
@@ -1,58 +0,0 @@
-{ stdenv, fetchurl, dpkg, bash, python27Packages }:
-
-let
-  py = python27Packages;
-in
-stdenv.mkDerivation rec {
-  name = "cura-lulzbot-${version}";
-  version = "15.02.1-1.03-5064";
-
-  src =
-    if stdenv.hostPlatform.system == "x86_64-linux" then
-      fetchurl {
-        url = "https://download.alephobjects.com/ao/aodeb/dists/jessie/main/binary-amd64/cura_${version}_amd64.deb";
-        sha256 = "1gsfidg3gim5pjbl82vkh0cw4ya253m4p7nirm8nr6yjrsirkzxg";
-      }
-    else if stdenv.hostPlatform.system == "i686-linux" then
-      fetchurl {
-        url = "http://download.alephobjects.com/ao/aodeb/dists/jessie/main/binary-i386/cura_${version}_i386.deb";
-        sha256 = "0xd3df6bxq4rijgvsqvps454jkc1nzhxbdzzj6j2w317ppsbhyc1";
-      }
-    else throw "${name} is not supported on ${stdenv.hostPlatform.system}";
-
-  python_deps = with py; [ pyopengl pyserial numpy wxPython30 power setuptools ];
-  pythonPath = python_deps;
-  propagatedBuildInputs = python_deps;
-  buildInputs = [ dpkg bash py.wrapPython ];
-
-  phases = [ "unpackPhase" "installPhase" ];
-  unpackPhase = "dpkg-deb -x ${src} ./";
-
-  installPhase = ''
-    mkdir -p $out/bin
-    cp -r usr/share $out/share
-    find $out/share -type f -exec sed -i 's|/usr/share/cura|$out/share/cura|g' "{}" \;
-
-    cat <<EOT > $out/bin/cura
-    #!${bash}/bin/bash
-    PYTHONPATH=$PYTHONPATH:$out/share/cura ${py.python}/bin/python $out/share/cura/cura.py "\$@"
-    EOT
-
-    chmod 555 $out/bin/cura
-  '';
-
-  meta = with stdenv.lib; {
-    description = "3D printing host software for the Lulzbot";
-
-     longDescription = ''
-       Cura LulzBot Edition is a fork of the 3D printing/slicing
-       software from Ultimaker, with changes to support 3D printers
-       from Aleph Objects.
-     '';
-
-    homepage = https://www.lulzbot.com/cura/;
-    license = licenses.agpl3;
-    platforms = platforms.linux;
-    maintainers = with maintainers; [ pjones ];
-  };
-}
diff --git a/pkgs/applications/misc/cura/lulzbot/curaengine.nix b/pkgs/applications/misc/cura/lulzbot/curaengine.nix
new file mode 100644
index 000000000000..e44f43d22bfe
--- /dev/null
+++ b/pkgs/applications/misc/cura/lulzbot/curaengine.nix
@@ -0,0 +1,26 @@
+{ stdenv, callPackage, fetchgit, fetchpatch, cmake, libarcusLulzbot, stb, protobuf }:
+
+stdenv.mkDerivation rec {
+  name = "curaengine-lulzBot-${version}";
+  version = "3.6.18";
+
+  src = fetchgit {
+    url = https://code.alephobjects.com/source/curaengine-lulzbot.git;
+    rev = "ec6a1a0f0aa387ef97e5c106633cf8d7fb9cd00d";
+    sha256 = "0wdkvg1hmqp1gaym804lw09x4ngf5ffasd861jhflpy7djbmkfn8";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ libarcusLulzbot stb protobuf ];
+
+  cmakeFlags = [ "-DCURA_ENGINE_VERSION=${version}" ];
+
+  meta = with stdenv.lib; {
+    description = "A powerful, fast and robust engine for processing 3D models into 3D printing instruction";
+    homepage = https://code.alephobjects.com/source/curaengine-lulzbot/;
+    license = licenses.agpl3;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ chaduffy ];
+  };
+}
+
diff --git a/pkgs/applications/misc/cura/lulzbot/default.nix b/pkgs/applications/misc/cura/lulzbot/default.nix
new file mode 100644
index 000000000000..2d32d1895f9b
--- /dev/null
+++ b/pkgs/applications/misc/cura/lulzbot/default.nix
@@ -0,0 +1,78 @@
+{ lib, callPackage, fetchgit, cmake, jq, python3Packages, qtbase, qtquickcontrols2 }:
+
+let
+  # admittedly, we're using (printer firmware) blobs when we could compile them ourselves.
+  curaBinaryDataVersion = "3.6.18"; # Marlin v2.0.0.144. Keep this accurate wrt. the below.
+  curaBinaryData = fetchgit {
+    url = https://code.alephobjects.com/diffusion/CBD/cura-binary-data.git;
+    rev = "cdc046494bbfe1f65bfb34659a257eef9a0100a0";
+    sha256 = "0v0s036gxdjiglas2yzw95alv60sw3pq5k1zrrhmw9mxr4irrblb";
+  };
+
+  libarcusLulzbot = callPackage ./libarcus.nix {
+    inherit (python3Packages) buildPythonPackage sip pythonOlder;
+  };
+  libsavitarLulzbot = callPackage ./libsavitar.nix {
+    inherit (python3Packages) buildPythonPackage sip pythonOlder;
+  };
+
+  inherit (python3Packages) buildPythonPackage pyqt5 numpy scipy shapely pythonOlder;
+  curaengine = callPackage ./curaengine.nix {
+    inherit libarcusLulzbot;
+  };
+  uraniumLulzbot = callPackage ./uranium.nix {
+    inherit callPackage libarcusLulzbot;
+    inherit (python3Packages) buildPythonPackage pyqt5 numpy scipy shapely pythonOlder;
+  };
+in
+python3Packages.buildPythonApplication rec {
+  name = "cura-lulzbot-${version}";
+  version = "3.6.18";
+
+  src = fetchgit {
+    url = https://code.alephobjects.com/source/cura-lulzbot.git;
+    rev = "71f1ac5a2b9f535175a3858a565930348358a9ca";
+    sha256 = "0by06fpxvdgy858lwhsccbmvkdq67j2s1cz8v6jnrnjrsxk7vzka";
+  };
+
+  format = "other"; # using cmake to build
+  buildInputs = [ qtbase qtquickcontrols2 ];
+  # numpy-stl temporarily disabled due to https://code.alephobjects.com/T8415
+  propagatedBuildInputs = with python3Packages; [ pyserial requests zeroconf ] ++ [ libsavitarLulzbot uraniumLulzbot libarcusLulzbot ]; # numpy-stl
+  nativeBuildInputs = [ cmake python3Packages.wrapPython ];
+
+  cmakeFlags = [
+    "-DURANIUM_DIR=${uraniumLulzbot.src}"
+    "-DCURA_VERSION=${version}"
+  ];
+
+  postPatch = ''
+    sed -i 's,/python''${PYTHON_VERSION_MAJOR}/dist-packages,/python''${PYTHON_VERSION_MAJOR}.''${PYTHON_VERSION_MINOR}/site-packages,g' CMakeLists.txt
+    sed -i 's, executable_name = .*, executable_name = "${curaengine}/bin/CuraEngine",' plugins/CuraEngineBackend/CuraEngineBackend.py
+  '';
+
+  preFixup = ''
+    substituteInPlace "$out/bin/cura-lulzbot" --replace 'import cura.CuraApplication' 'import Savitar; import cura.CuraApplication'
+    ln -sT "${curaBinaryData}/cura/resources/firmware" "$out/share/cura/resources/firmware"
+    ln -sT "${uraniumLulzbot}/share/uranium" "$out/share/uranium"
+    ${jq}/bin/jq --arg out "$out" '.build=$out' >"$out/version.json" <<'EOF'
+    ${builtins.toJSON {
+      cura = version;
+      cura_version = version;
+      binarydata = curaBinaryDataVersion;
+      engine = curaengine.version;
+      libarcus = libarcusLulzbot.version;
+      libsavitar = libsavitarLulzbot.version;
+      uranium = uraniumLulzbot.version;
+    }}
+    EOF
+  '';
+
+  meta = with lib; {
+    description = "3D printer / slicing GUI built on top of the Uranium framework";
+    homepage = https://code.alephobjects.com/diffusion/CURA/;
+    license = licenses.agpl3;  # a partial relicense to LGPL has happened, but not certain that all AGPL bits are expunged
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ chaduffy ];
+  };
+}
diff --git a/pkgs/applications/misc/cura/lulzbot/libarcus.nix b/pkgs/applications/misc/cura/lulzbot/libarcus.nix
new file mode 100644
index 000000000000..589111df78b8
--- /dev/null
+++ b/pkgs/applications/misc/cura/lulzbot/libarcus.nix
@@ -0,0 +1,33 @@
+{ stdenv, buildPythonPackage, fetchgit, fetchurl, cmake, sip, protobuf, pythonOlder }:
+
+buildPythonPackage rec {
+  pname = "libarcus";
+  version = "3.6.18";
+  format = "other";
+
+  src = fetchgit {
+    url = https://code.alephobjects.com/source/arcus.git;
+    rev = "c795c0644591703ce04e1fd799fc97b1539031aa";
+    sha256 = "1yap9wbqxbjx3kqyqcsldny4mlcm33ywiwpdjlfgs0wjahfg4ip0";
+  };
+
+  disabled = pythonOlder "3.4.0";
+
+  propagatedBuildInputs = [ sip ];
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ protobuf ];
+
+  postPatch = ''
+    # To workaround buggy SIP detection which overrides PYTHONPATH
+    sed -i '/SET(ENV{PYTHONPATH}/d' cmake/FindSIP.cmake
+  '';
+
+  meta = with stdenv.lib; {
+    description = "Communication library between internal components for Ultimaker software";
+    homepage = https://code.alephobjects.com/source/arcus/;
+    license = licenses.lgpl3Plus;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ chaduffy ];
+  };
+}
+
diff --git a/pkgs/applications/misc/cura/lulzbot/libsavitar.nix b/pkgs/applications/misc/cura/lulzbot/libsavitar.nix
new file mode 100644
index 000000000000..7a1781f62ce7
--- /dev/null
+++ b/pkgs/applications/misc/cura/lulzbot/libsavitar.nix
@@ -0,0 +1,33 @@
+{ stdenv, buildPythonPackage, pythonOlder, fetchgit, cmake, sip }:
+
+buildPythonPackage rec {
+  pname = "libsavitar-lulzbot";
+  name = "libsavitar-lulzbot";
+  version = "3.6.18";
+  format = "other";
+
+  src = fetchgit {
+    url = https://code.alephobjects.com/source/savitar.git;
+    rev = "988a26d35b2a1d042f8c38938ccda77ab146af7d";
+    sha256 = "146agw3a92azkgs5ahmn2rrck4an78m2r3pcss6ihmb60lx165k7";
+  };
+
+  postPatch = ''
+    # To workaround buggy SIP detection which overrides PYTHONPATH
+    sed -i '/SET(ENV{PYTHONPATH}/d' cmake/FindSIP.cmake
+  '';
+
+  nativeBuildInputs = [ cmake ];
+
+  propagatedBuildInputs = [ sip ];
+
+  disabled = pythonOlder "3.4.0";
+
+  meta = with stdenv.lib; {
+    description = "C++ implementation of 3mf loading with SIP python bindings";
+    homepage = https://github.com/Ultimaker/libSavitar;
+    license = licenses.lgpl3Plus;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ chaduffy ];
+  };
+}
diff --git a/pkgs/applications/misc/cura/lulzbot/uranium-qt512-support.patch b/pkgs/applications/misc/cura/lulzbot/uranium-qt512-support.patch
new file mode 100644
index 000000000000..2c666a98c8f7
--- /dev/null
+++ b/pkgs/applications/misc/cura/lulzbot/uranium-qt512-support.patch
@@ -0,0 +1,16 @@
+diff --git a/UM/Qt/Bindings/i18nCatalogProxy.py b/UM/Qt/Bindings/i18nCatalogProxy.py
+index 7e2bb16c..cec70dd6 100644
+--- a/UM/Qt/Bindings/i18nCatalogProxy.py
++++ b/UM/Qt/Bindings/i18nCatalogProxy.py
+@@ -86,9 +86,9 @@ class i18nCatalogProxy(QObject): # [CodeStyle: Ultimaker code style requires cla
+     #   \todo Move this to a more generic place so more things can use it.
+     def _wrapFunction(self, engine, this_object, function):
+         # JavaScript code that wraps the Python method call in a closure
+-        wrap_js = """function(this_object) {{
++        wrap_js = """(function(this_object) {{
+             return function({args}) {{ return this_object.{function}({args}) }}
+-        }}"""
++        }})"""
+ 
+         # Get the function name and argument list.
+         function_name = function.__name__
diff --git a/pkgs/applications/misc/cura/lulzbot/uranium.nix b/pkgs/applications/misc/cura/lulzbot/uranium.nix
new file mode 100644
index 000000000000..43869a0edc62
--- /dev/null
+++ b/pkgs/applications/misc/cura/lulzbot/uranium.nix
@@ -0,0 +1,41 @@
+{ stdenv, callPackage, fetchurl, fetchgit, buildPythonPackage, fetchFromGitHub, python, cmake
+, pyqt5, numpy, scipy, shapely, libarcusLulzbot, doxygen, gettext, pythonOlder }:
+
+buildPythonPackage rec {
+  version = "3.6.18";
+  pname = "uranium";
+  name = "uraniumLulzbot";
+  format = "other";
+
+  src = fetchgit {
+    url = https://code.alephobjects.com/diffusion/U/uranium.git;
+    rev = "33df88a7414375ac924ac761113baa48d2ced2b4";
+    sha256 = "109cbv7y105crbrzfp70lmcr9n20ap5c97i5qd46fmxbx86yj7f8";
+  };
+
+  disabled = pythonOlder "3.5.0";
+
+  buildInputs = [ python gettext ];
+  propagatedBuildInputs = [ pyqt5 numpy scipy shapely libarcusLulzbot ];
+  nativeBuildInputs = [ cmake doxygen ];
+
+  # Qt 5.12+ support; see https://code.alephobjects.com/rU70b73ba0a270799b9eacf78e400aa8b8ab3fb2ee
+  patches = [ ./uranium-qt512-support.patch ];
+
+  postPatch = ''
+    sed -i 's,/python''${PYTHON_VERSION_MAJOR}/dist-packages,/python''${PYTHON_VERSION_MAJOR}.''${PYTHON_VERSION_MINOR}/site-packages,g' CMakeLists.txt
+    sed -i \
+     -e "s,Resources.addSearchPath(os.path.join(os.path.abspath(os.path.dirname(__file__)).*,Resources.addSearchPath(\"$out/share/uranium/resources\")," \
+     -e "s,self._plugin_registry.addPluginLocation(os.path.join(os.path.abspath(os.path.dirname(__file__)).*,self._plugin_registry.addPluginLocation(\"$out/lib/uranium/plugins\")," \
+     UM/Application.py
+  '';
+
+  meta = with stdenv.lib; {
+    description = "A Python framework for building Desktop applications";
+    homepage = https://code.alephobjects.com/diffusion/U/;
+    license = licenses.lgpl3Plus;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ chaduffy ];
+  };
+}
+
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e5a9f44c8d2b..4a1a79947975 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -20472,14 +20472,13 @@ in
     curaengine = curaengine_stable;
   };
 
-  curaengine = callPackage ../applications/misc/curaengine {
-    inherit (python3.pkgs) libarcus;
-  };
+  curaengine = callPackage ../applications/misc/curaengine { inherit (python3.pkgs) libarcus; };
+
   cura = qt5.callPackage ../applications/misc/cura { };
 
   curaPlugins = callPackage ../applications/misc/cura/plugins.nix { };
 
-  curaLulzbot = callPackage ../applications/misc/cura/lulzbot.nix { };
+  curaLulzbot = qt5.callPackage ../applications/misc/cura/lulzbot/default.nix { };
 
   curaByDagoma = callPackage ../applications/misc/curabydagoma { };