diff --git a/murex.nix b/murex.nix
index ad75308..f5c5e69 100644
--- a/murex.nix
+++ b/murex.nix
@@ -64,7 +64,7 @@
 
   users.extraUsers.gebner = {
     isNormalUser = true;
-    extraGroups = [ "wheel" "networkmanager" "audio" "transmission" ];
+    extraGroups = [ "wheel" "networkmanager" "audio" "dialout" ];
     shell = pkgs.fish;
     # password = if config.virtualisation != null then "" else null;
   };
@@ -135,6 +135,19 @@
       })
     ];
   };
+  systemd.services.setupGpioForRelais = rec {
+    wantedBy = [ "octoprint.service" ];
+    serviceConfig = {
+      Type = "oneshot";
+      RemainAfterExit = "yes";
+    };
+    script = ''
+      if echo 17 > /sys/class/gpio/export; then
+        echo high > /sys/class/gpio/gpio17/direction
+      fi
+      chgrp dialout /sys/class/gpio/gpio17/value
+    '';
+  };
   users.users.${config.services.octoprint.user}.extraGroups = [
     "dialout" # ttyUSB access
   ];