Let's give it a try

configuration.nix

@@ -188,7 +188,7 @@ in
       urwid
     ]))
 
-    # (pkgs.callPackage ./mfcl2690dw/default.nix { })
+    (pkgs.callPackage ./mfcl2690dw/default.nix { })
   ];
 
   networking.firewall.allowedTCPPorts = [ 22 ];

mfcl2690dw/default.nix

@@ -1,44 +1,83 @@
-{ pkgsi686Linux, lib, stdenv, fetchurl, dpkg, makeWrapper, coreutils, ghostscript, gnugrep, gnused, which, perl }:
+{ lib, stdenv, fetchurl, dpkg, autoPatchelfHook, makeWrapper, perl, gnused, ghostscript, file, coreutils, gnugrep, which }:
+
+let
+  arches = [ "x86_64" "i686" "armv7l" ];
+
+  runtimeDeps = [
+    ghostscript
+    file
+    gnused
+    gnugrep
+    coreutils
+    which
+  ];
+
+  printerName = "mfcl2690dw";
+in
 
 stdenv.mkDerivation rec {
-  pname = "mfcl2690dwpdrv";
+  pname = "cups-brother-${printerName}";
   version = "4.0.0-1";
 
+  nativeBuildInputs = [ dpkg makeWrapper autoPatchelfHook ];
+  buildInputs = [ perl ];
+
+  dontUnpack = true;
+
   src = fetchurl {
-    url = "https://download.brother.com/welcome/dlf101727/${pname}-${version}.i386.deb";
+    url = "https://download.brother.com/welcome/dlf105065/${printerName}pdrv-${version}.i386.deb";
     sha256 = "765da49f1f0d68ed36ba553e6e60aa5030e87845b74afe0d7d46ebab28ab5256";
   };
 
-  nativeBuildInputs = [ dpkg makeWrapper ];
-
-  unpackPhase = "dpkg-deb -x $src $out";
-
   installPhase = ''
-    dir=$out/opt/brother/Printers/MFCL2690DW
+    runHook preInstall
 
-    substituteInPlace $dir/lpd/lpdfilter \
-      --replace /usr/bin/perl ${perl}/bin/perl \
-      --replace "BR_PRT_PATH =~" "BR_PRT_PATH = \"$dir\"; #" \
-      --replace "PRINTER =~" "PRINTER = \"MFCL2690DW\"; #"
+    mkdir -p $out
+    dpkg-deb -x $src $out
 
-    wrapProgram $dir/lpd/filter_MFCL2690DW \
-      --prefix PATH : ${lib.makeBinPath [
-        coreutils ghostscript gnugrep gnused which
-      ]}
+    # delete unnecessary files for the current architecture
+  '' + lib.concatMapStrings (arch: ''
+    echo Deleting files for ${arch}
+    rm -r "$out/opt/brother/Printers/MFCL2690DW/lpd/${arch}"
+  '') (builtins.filter (arch: arch != stdenv.hostPlatform.linuxArch) arches) + ''
 
-    # need to use i686 glibc here, these are 32bit proprietary binaries
-    interpreter=${pkgsi686Linux.glibc}/lib/ld-linux.so.2
-    patchelf --set-interpreter "$interpreter" $dir/inf/braddprinter
-    patchelf --set-interpreter "$interpreter" $dir/lpd/brprintconflsr3
-    patchelf --set-interpreter "$interpreter" $dir/lpd/rawtobr3
-  '';
+      # bundled scripts don't understand the arch subdirectories for some reason
+      ln -s \
+        "$out/opt/brother/Printers/MFCL2690DW/lpd/${stdenv.hostPlatform.linuxArch}/"* \
+        "$out/opt/brother/Printers/MFCL2690DW/lpd/"
 
-  meta = {
-    description = "Brother MFC-L2690DW lpr driver";
+      # Fix global references and replace auto discovery mechanism with hardcoded values
+      substituteInPlace $out/opt/brother/Printers/MFCL2690DW/lpd/lpdfilter \
+        --replace /opt "$out/opt" \
+        --replace "my \$BR_PRT_PATH =" "my \$BR_PRT_PATH = \"$out/opt/brother/Printers/MFCL2690DW\"; #" \
+        --replace "PRINTER =~" "PRINTER = \"MFCL2690DW\"; #"
+
+      # Make sure all executables have the necessary runtime dependencies available
+      find "$out" -executable -and -type f | while read file; do
+        wrapProgram "$file" --prefix PATH : "${lib.makeBinPath runtimeDeps}"
+      done
+
+      # Symlink filter and ppd into a location where CUPS will discover it
+      mkdir -p $out/lib/cups/filter
+      mkdir -p $out/share/cups/model
+
+      ln -s \
+        $out/opt/brother/Printers/MFCL2690DW/lpd/lpdfilter \
+        $out/lib/cups/filter/brother_lpdwrapper_MFCL2690DW
+
+      ln -s \
+        $out/opt/brother/Printers/MFCL2690DW/cupswrapper/brother-MFCL2690DW-cups-en.ppd \
+        $out/share/cups/model/
+
+      runHook postInstall
+    '';
+
+  meta = with lib; {
     homepage = "http://www.brother.com/";
+    description = "Brother MFC-L2690DW printer driver";
     sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
-    license = lib.licenses.unfree;
-    platforms = [ "x86_64-linux" "i686-linux" ];
-    maintainers = [ lib.maintainers.Enzime ];
+    license = licenses.unfree;
+    platforms = builtins.map (arch: "${arch}-linux") arches;
+    maintainers = [ maintainers.lovesegfault ];
   };
 }