diff --git a/nixos/cad.nix b/nixos/cad.nix
index 756a79d..052521e 100644
--- a/nixos/cad.nix
+++ b/nixos/cad.nix
@@ -4,6 +4,7 @@
   environment.systemPackages = with pkgs; [
     pkgs.openscad
     pkgs.blender
+    #pkgs.blender-cadsketcher
     #pkgs.py-slvs
     pkgs.freecad
     (pkgs.appimageTools.wrapType2
diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index a19147a..b5ad121 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -45,7 +45,7 @@
 
   networking.hostName = hostname; # Define your hostname.
   networking.networkmanager.enable = true;
-  nix.trustedUsers = [ "root" "traverseda"];
+  nix.settings.trusted-users = [ "root" "traverseda" "logic11"];
 
   virtualisation.vmVariant = {
     # following configuration is added only when building VM with build-vm
diff --git a/pkgs/blender-cadsketcher/default.nix b/pkgs/blender-cadsketcher/default.nix
index 78cd433..1c34bc3 100644
--- a/pkgs/blender-cadsketcher/default.nix
+++ b/pkgs/blender-cadsketcher/default.nix
@@ -1,57 +1,34 @@
-{
-  description = "Blender CAD Sketcher";
+{ lib, blender, python3Packages, fetchFromGitHub, pkgs }:
 
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
-  outputs = {
-    self,
-    nixpkgs,
-    flake-utils,
-  }:
-    flake-utils.lib.eachDefaultSystem (system: let
-      pkgs = nixpkgs.legacyPackages.${system};
-    in {
-      devShells.default = pkgs.mkShell {
-        shellHook = ''
-        '';
-        packages = [
-          (
-            let
-              py-slvs = pythonPkgs:
-                pythonPkgs.buildPythonPackage rec {
-                  pname = "py-slvs";
-                  version = "1.0.6";
+let
+  py-slvs = python3Packages.buildPythonPackage rec {
+    pname = "py-slvs";
+    version = "1.0.6";
 
-                  src = pythonPkgs.fetchPypi {
-                    pname = "py_slvs";
-                    version = "1.0.6";
-                    sha256 = "sha256-U6T/aXy0JTC1ptL5oBmch0ytSPmIkRA8XOi31NpArnI=";
-                  };
+    src = fetchFromGitHub {
+      owner = "realthunder";
+      repo = "slvs_py";
+      rev = "v${version}";
+      sha256 = "hBuW8Guqli/jMFPygG8jq5ZLs508Ss+lmBORuW6yTxs=";
+    };
 
-                  nativeBuildInputs = with pkgs; [swig];
-                  pyproject = true;
+    nativeBuildInputs = [ pkgs.swig pkgs.cmake pkgs.ninja ];
 
-                  propagatedBuildInputs = with pythonPkgs; [
-                    cmake
-                    ninja
-                    setuptools
-                    scikit-build
-                  ];
+    cmakeFlags = [
+      "-B."
+      "-H${src}"
+    ];
 
-                  dontUseCmakeConfigure = true;
+    propagatedBuildInputs = with python3Packages; [ setuptools wheel scikit-build cmake ninja ];
 
-                  meta = with pkgs.lib; {
-                    description = "Python binding of SOLVESPACE geometry constraint solver";
-                    homepage = "https://github.com/realthunder/slvs_py";
-                    license = licenses.gpl3;
-                  };
-                };
-
-              blenderCadSketcher = pkgs.blender.withPackages (p: [(py-slvs p)]);
-            in
-              blenderCadSketcher
-          )
-        ];
-      };
-    });
-}
+    meta = {
+      description = "Python binding of SOLVESPACE geometry constraint solver";
+      homepage = "https://github.com/realthunder/slvs_py";
+      license = lib.licenses.gpl3;
+    };
+  };
+in
+  blender.overrideAttrs (oldAttrs: {
+    name = "blender-cadsketcher-${oldAttrs.version}";
+    buildInputs = oldAttrs.buildInputs ++ [ py-slvs ];
+  })
diff --git a/pkgs/creality-print/default.nix b/pkgs/creality-print/default.nix
index 5513351..21712e6 100644
--- a/pkgs/creality-print/default.nix
+++ b/pkgs/creality-print/default.nix
@@ -1,11 +1,16 @@
 { pkgs ? import <nixpkgs> {} }:
 
 let
+  # URL and SHA256 for Creality Print AppImage
+  appimageUrl = "https://file2-cdn.creality.com/file/05a4538e0c7222ce547eb8d58ef0251e/Creality_Print-v4.3.7.6627-x86_64-Release.AppImage";
+  appimageSha256 = "sha256-WUsL7UbxSY94H4F1Ww8vLsfRyeg2/DZ+V4B6eH3M6+M=";
+
+  # Wrap the AppImage using appimageTools
   creality-print = pkgs.appimageTools.wrapType2 {
     name = "creality-print";
     src = pkgs.fetchurl {
-      url = "https://file2-cdn.creality.com/file/05a4538e0c7222ce547eb8d58ef0251e/Creality_Print-v4.3.7.6627-x86_64-Release.AppImage";
-      sha256 = "sha256-WUsL7UbxSY94H4F1Ww8vLsfRyeg2/DZ+V4B6eH3M6+M=";
+      url = appimageUrl;
+      sha256 = appimageSha256;
     };
     profile = ''
       export LC_ALL=C.UTF-8
@@ -13,6 +18,7 @@ let
     multiPkgs = pkgs: with pkgs; [ qt5.qtbase libGL libz ];
   };
 
+  # Create a desktop entry for Creality Print
   desktopItem = pkgs.makeDesktopItem {
     name = "creality-print";
     exec = "${creality-print}/bin/creality-print";
@@ -23,24 +29,29 @@ let
   };
 
 in
+# Define the package
 pkgs.stdenv.mkDerivation {
   name = "creality-print-app";
   buildInputs = [ creality-print ];
 
   nativeBuildInputs = [ pkgs.makeWrapper ];
 
+  # No sources to unpack
   unpackPhase = "true";
 
+  # Installation phase
   installPhase = ''
     mkdir -p $out/bin $out/share/applications
     cp ${creality-print}/bin/* $out/bin
     ln -s ${desktopItem}/share/applications/* $out/share/applications/
   '';
 
+  # Package metadata
   meta = with pkgs.lib; {
     description = "Creality Print is a 3D printer software for Creality printers";
     homepage = "https://www.creality.com/";
-    license = licenses.unfree;
+    license = licenses.gpl3;
     platforms = platforms.linux;
   };
 }
+
diff --git a/pkgs/default.nix b/pkgs/default.nix
index 6a65429..e98b0d4 100644
--- a/pkgs/default.nix
+++ b/pkgs/default.nix
@@ -6,5 +6,5 @@
 {
   # example = pkgs.callPackage ./example { };
   creality-print = pkgs.callPackage ./creality-print { };
-  py-slvs = pkgs.callPackage ./py-slvs { };
+  blender-cadsketcher = pkgs.callPackage ./blender-cadsketcher { };
 }
diff --git a/pkgs/py-slvs/default.nix b/pkgs/py-slvs/default.nix
deleted file mode 100644
index 5482acc..0000000
--- a/pkgs/py-slvs/default.nix
+++ /dev/null
@@ -1,57 +0,0 @@
-{
-  description = "Blender CAD Sketcher";
-
-  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
-  outputs = {
-    self,
-    nixpkgs,
-    flake-utils,
-  }:
-    flake-utils.lib.eachDefaultSystem (system: let
-      pkgs = nixpkgs.legacyPackages.${system};
-    in {
-      devShells.default = pkgs.mkShell {
-        shellHook = ''
-        '';
-        packages = [
-          (
-            let
-              py-slvs = pythonPkgs:
-                pythonPkgs.buildPythonPackage rec {
-                  pname = "py-slvs";
-                  version = "1.0.6";
-
-                  src = pythonPkgs.fetchPypi {
-                    pname = "py_slvs";
-                    version = "1.0.6";
-                    sha256 = "sha256-U6T/aXy0JTC1ptL5oBmch0ytSPmIkRA8XOi31NpArnI=";
-                  };
-
-                  nativeBuildInputs = with pkgs; [swig];
-                  pyproject = true;
-
-                  propagatedBuildInputs = with pythonPkgs; [
-                    cmake
-                    ninja
-                    setuptools
-                    scikit-build
-                  ];
-
-                  dontUseCmakeConfigure = true;
-
-                  meta = with pkgs.lib; {
-                    description = "Python binding of SOLVESPACE geometry constraint solver";
-                    homepage = "https://github.com/realthunder/slvs_py";
-                    license = licenses.gpl3;
-                  };
-                };
-
-              blenderWithPySlvs = pkgs.blender.withPackages (p: [(py-slvs p)]);
-            in
-              blenderWithPySlvs
-          )
-        ];
-      };
-    });
-}