split config

modules/printing.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}: {
+  config = {
+    services = {
+      # Enable CUPS to print documents.
+      printing.enable = true;
+
+      avahi = {
+        enable = true; # runs the Avahi daemon
+        nssmdns4 = true; # enables the mDNS NSS plug-in
+        openFirewall = true; # opens the firewall for UDP port 5353
+      };
+    };
+  };
+}