diff --git a/lib/Slic3r/GUI/PresetEditor.pm b/lib/Slic3r/GUI/PresetEditor.pm
index 1a6e540c1..256394042 100644
--- a/lib/Slic3r/GUI/PresetEditor.pm
+++ b/lib/Slic3r/GUI/PresetEditor.pm
@@ -1046,7 +1046,6 @@ sub build {
             my $optgroup = $page->new_optgroup('Optional information');
             $optgroup->append_single_option_line('filament_density', 0);
             $optgroup->append_single_option_line('filament_cost', 0);
-            $optgroup->append_single_option_line('filament_settings_id', 0);
         }
     }
     
diff --git a/lib/Slic3r/Print/GCode.pm b/lib/Slic3r/Print/GCode.pm
index ef6515473..b856b498a 100644
--- a/lib/Slic3r/Print/GCode.pm
+++ b/lib/Slic3r/Print/GCode.pm
@@ -160,7 +160,10 @@ sub export {
     $self->_print_first_layer_temperature(0)
         if $include_start_extruder_temp;
     printf $fh "%s\n", Slic3r::ConditionalGCode::apply_math($gcodegen->placeholder_parser->process($self->config->start_gcode));
+    my $filament_extruder = 0;
     foreach my $start_gcode (@{ $self->config->start_filament_gcode }) { # process filament gcode in order
+        $gcodegen->placeholder_parser->set("filament_extruder_id", $filament_extruder);
+        $filament_extruder++;
         printf $fh "%s\n", Slic3r::ConditionalGCode::apply_math($gcodegen->placeholder_parser->process($start_gcode));
     }
     $self->_print_first_layer_temperature(1)
@@ -303,7 +306,10 @@ sub export {
     # write end commands to file
     print $fh $gcodegen->retract;   # TODO: process this retract through PressureRegulator in order to discharge fully
     print $fh $gcodegen->writer->set_fan(0);
+    $filament_extruder = 0;
     foreach my $end_gcode (@{ $self->config->end_filament_gcode }) { # Process filament-specific gcode in extruder order.
+        $gcodegen->placeholder_parser->set("filament_extruder_id", $filament_extruder);
+        $filament_extruder++;
         printf $fh "%s\n", Slic3r::ConditionalGCode::apply_math($gcodegen->placeholder_parser->process($end_gcode));
     }
     printf $fh "%s\n", Slic3r::ConditionalGCode::apply_math($gcodegen->placeholder_parser->process($self->config->end_gcode));
diff --git a/package/osx/make_dmg.sh b/package/osx/make_dmg.sh
index 7839a6414..5b06cd9f3 100755
--- a/package/osx/make_dmg.sh
+++ b/package/osx/make_dmg.sh
@@ -1,53 +1,55 @@
 #!/bin/bash
+set -euo pipefail
 
 # Assembles an installation bundle from a built copy of Slic3r.
 # Requires PAR::Packer to be installed for the version of
 # perl copied.
 # Adapted from script written by bubnikv for Prusa3D.
 # Run from slic3r repo root directory.
-SLIC3R_VERSION=$(grep "VERSION" xs/src/libslic3r/libslic3r.h | awk -F\" '{print $2}')
-
-if [ "$#" -ne 1 ]; then
-    echo "Usage: $(basename $0) dmg_name"
-    exit 1;
-fi
 
 WD=$(dirname $0)
+appname=Slic3r
+
 # Determine if this is a tagged (release) commit.
 # Change the build id accordingly.
-if [ $(git describe &>/dev/null) ]; then
-    TAGGED=true
+if [ $(git describe --exact-match &>/dev/null) ]; then
+    echo "This is a tagged build"
     SLIC3R_BUILD_ID=$(git describe)
 else
-    TAGGED=false
-    SLIC3R_BUILD_ID=${SLIC3R_VERSION}
-fi
-if [ -z ${GIT_BRANCH+x} ] && [ -z ${APPVEYOR_REPO_BRANCH+x} ]; then
-    current_branch=$(git symbolic-ref HEAD | sed 's!refs\/heads\/!!')
-else
-    current_branch="unknown"
-    if [ ! -z ${GIT_BRANCH+x} ]; then
-        echo "Setting to GIT_BRANCH"
-        current_branch=$(echo $GIT_BRANCH | cut -d / -f 2)
+    # Get the current branch
+    if [ -z ${GIT_BRANCH+x} ] && [ -z ${APPVEYOR_REPO_BRANCH+x} ]; then
+        current_branch=$(git symbolic-ref HEAD | sed 's!refs\/heads\/!!')
+    else
+        current_branch="unknown"
+        if [ ! -z ${GIT_BRANCH+x} ]; then
+            echo "Setting to GIT_BRANCH"
+            current_branch=$(echo $GIT_BRANCH | cut -d / -f 2)
+        fi
+        if [ ! -z ${APPVEYOR_REPO_BRANCH+x} ]; then
+            echo "Setting to APPVEYOR_REPO_BRANCH"
+            current_branch=$APPVEYOR_REPO_BRANCH
+        fi
     fi
-    if [ ! -z ${APPVEYOR_REPO_BRANCH+x} ]; then
-        echo "Setting to APPVEYOR_REPO_BRANCH"
-        current_branch=$APPVEYOR_REPO_BRANCH
+    
+    if [ "$current_branch" == "master" ]; then
+        echo "This is a build of the master branch"
+        SLIC3R_VERSION=$(grep "VERSION" xs/src/libslic3r/libslic3r.h | awk -F\" '{print $2}')
+        SLIC3R_BUILD_ID=${SLIC3R_VERSION}-$(git rev-parse --short HEAD)
+    else
+        echo "This is a build of a non-master branch"
+        appname=Slic3r-${current_branch}
+        SLIC3R_BUILD_ID=${current_branch}-$(git rev-parse --short HEAD)
     fi
 fi
 
+dmgfile=slic3r-${SLIC3R_BUILD_ID}.dmg
+echo "DMG filename: ${dmgfile}"
+
 # If we're on a branch, add the branch name to the app name.
-if [ "$current_branch" == "master" ]; then
-    appname=Slic3r
-    dmgfile=slic3r-${SLIC3R_BUILD_ID}-${1}.dmg
-else
-    appname=Slic3r-$(git symbolic-ref HEAD | sed 's!refs\/heads\/!!')
-    dmgfile=slic3r-${SLIC3R_BUILD_ID}-${1}-$(git symbolic-ref HEAD | sed 's!refs\/heads\/!!').dmg
-fi
+
 rm -rf $WD/_tmp
 mkdir -p $WD/_tmp
 
-
 # OSX Application folder shenanigans.
 appfolder="$WD/${appname}.app"
 macosfolder=$appfolder/Contents/MacOS
@@ -104,10 +106,9 @@ echo "Copying perl from $PERL_BIN"
 cp -f $PERL_BIN $macosfolder/perl-local
 ${PP_BIN} \
           -M $(grep -v "^#" ${WD}/../common/coreperl | xargs | awk 'BEGIN { OFS=" -M "}; {$1=$1; print $0}') \
-          -B -p -e "print 123" -o $WD/_tmp/test.par
-unzip -o $WD/_tmp/test.par -d $WD/_tmp/
+          -B -p -e "print 123" -o $WD/_tmp/bundle.par
+unzip -o $WD/_tmp/bundle.par -d $WD/_tmp/
 cp -rf $WD/_tmp/lib/* $macosfolder/local-lib/lib/perl5/
-rm -rf $WD/_tmp
 
 echo "Cleaning bundle"
 rm -rf $macosfolder/local-lib/bin
@@ -140,23 +141,31 @@ make_plist
 
 echo $PkgInfoContents >$appfolder/Contents/PkgInfo
 
-if [[ -e "${KEYCHAIN_FILE}" ]]; then
+KEYCHAIN_FILE_=${KEYCHAIN_FILE:-}
+if [ ! -z $KEYCHAIN_FILE_ ]; then
     echo "Signing app..."
     chmod -R +w $macosfolder/*
-    security list-keychains -s "${KEYCHAIN_FILE}"
-    security default-keychain -s "${KEYCHAIN_FILE}"
-    security unlock-keychain -p "${KEYCHAIN_PASSWORD}" "${KEYCHAIN_FILE}"
+    security list-keychains -s "${KEYCHAIN_FILE_}"
+    security default-keychain -s "${KEYCHAIN_FILE_}"
+    security unlock-keychain -p "${KEYCHAIN_PASSWORD}" "${KEYCHAIN_FILE_}"
     codesign --sign "${KEYCHAIN_IDENTITY}" --deep "$appfolder"
+else
+    echo "No KEYCHAIN_FILE env variable; skipping codesign"
 fi
 
 echo "Creating dmg file...."
-hdiutil create -fs HFS+ -srcfolder "$appfolder" -volname "$appname" "$dmgfile"
+hdiutil create -fs HFS+ -srcfolder "$appfolder" -volname "$appname" "$WD/_tmp/$dmgfile"
 
-if [[ -e "${KEYCHAIN_FILE}" ]]; then
+# Compress the DMG image
+hdiutil convert "$WD/_tmp/$dmgfile" -format UDZO -imagekey zlib-level=9 -o "$dmgfile"
+
+if [ ! -z $KEYCHAIN_FILE_ ]; then
     echo "Signing app dmg..."
     chmod +w $dmgfile
-    security list-keychains -s "${KEYCHAIN_FILE}"
-    security default-keychain -s "${KEYCHAIN_FILE}"
-    security unlock-keychain -p "${KEYCHAIN_PASSWORD}" "${KEYCHAIN_FILE}"
+    security list-keychains -s "${KEYCHAIN_FILE_}"
+    security default-keychain -s "${KEYCHAIN_FILE_}"
+    security unlock-keychain -p "${KEYCHAIN_PASSWORD}" "${KEYCHAIN_FILE_}"
     codesign --sign "${KEYCHAIN_IDENTITY}" "$dmgfile"
 fi
+
+rm -rf $WD/_tmp
diff --git a/package/osx/plist.sh b/package/osx/plist.sh
index 8c62d2088..331a03d01 100755
--- a/package/osx/plist.sh
+++ b/package/osx/plist.sh
@@ -18,11 +18,7 @@ cat << EOF > $plistfile
   <key>CFBundleShortVersionString</key>
 EOF
 
-if [ $TAGGED ]; then
-    echo "  <string>Slic3r $SLIC3R_BUILD_ID</string>" >>$plistfile
-else
-    echo "  <string>Slic3r $SLIC3R_BUILD_ID-$(git rev-parse --short head)</string>" >>$plistfile
-fi
+echo "  <string>Slic3r $SLIC3R_BUILD_ID</string>" >>$plistfile
 
 cat << EOF >> $plistfile
   <key>CFBundleIdentifier</key>
diff --git a/xs/src/libslic3r/PrintConfig.cpp b/xs/src/libslic3r/PrintConfig.cpp
index 1521881ea..48d43fba5 100644
--- a/xs/src/libslic3r/PrintConfig.cpp
+++ b/xs/src/libslic3r/PrintConfig.cpp
@@ -447,15 +447,8 @@ PrintConfigDef::PrintConfigDef()
         def->default_value = opt;
     }
     
-    def = this->add("filament_settings_id", coStrings);
-    def->label = __TRANS("Custom GCode ID");
-    def->tooltip = __TRANS("Identifer for this filament. Used to mark specific filament profiles for custom gcode.");
-    def->cli = "filament-settings-id=s@";
-    {
-        ConfigOptionStrings* opt = new ConfigOptionStrings();
-        opt->values.push_back("");
-        def->default_value = opt;
-    }
+    def = this->add("filament_settings_id", coString);
+    def->default_value = new ConfigOptionString("");
     
     def = this->add("fill_angle", coFloat);
     def->label = __TRANS("Fill angle");
diff --git a/xs/src/libslic3r/PrintConfig.hpp b/xs/src/libslic3r/PrintConfig.hpp
index 99ba80dc6..17f629541 100644
--- a/xs/src/libslic3r/PrintConfig.hpp
+++ b/xs/src/libslic3r/PrintConfig.hpp
@@ -336,7 +336,6 @@ class GCodeConfig : public virtual StaticPrintConfig
     ConfigOptionFloats              filament_cost;
     ConfigOptionFloats              filament_max_volumetric_speed;
     ConfigOptionStrings             filament_notes;
-    ConfigOptionStrings             filament_settings_id;
     ConfigOptionBool                gcode_comments;
     ConfigOptionEnum<GCodeFlavor>   gcode_flavor;
     ConfigOptionBool                label_printed_objects;
@@ -381,7 +380,6 @@ class GCodeConfig : public virtual StaticPrintConfig
         OPT_PTR(filament_cost);
         OPT_PTR(filament_max_volumetric_speed);
         OPT_PTR(filament_notes);
-        OPT_PTR(filament_settings_id);
         OPT_PTR(gcode_comments);
         OPT_PTR(gcode_flavor);
         OPT_PTR(label_printed_objects);
diff --git a/xs/src/libslic3r/PrintGCode.cpp b/xs/src/libslic3r/PrintGCode.cpp
index 0af21863c..724679d0e 100644
--- a/xs/src/libslic3r/PrintGCode.cpp
+++ b/xs/src/libslic3r/PrintGCode.cpp
@@ -130,9 +130,12 @@ PrintGCode::output()
 
     // Apply gcode math to start gcode
     fh << apply_math(gcodegen.placeholder_parser->process(config.start_gcode.value));
-
-    for(const auto& start_gcode : config.start_filament_gcode.values) {
-        fh << apply_math(gcodegen.placeholder_parser->process(start_gcode));
+    {
+        auto filament_extruder {0U};
+        for(const auto& start_gcode : config.start_filament_gcode.values) {
+            gcodegen.placeholder_parser->set("filament_extruder_id", filament_extruder++);
+            fh << apply_math(gcodegen.placeholder_parser->process(start_gcode));
+        }
     }
     
     if (include_start_extruder_temp) this->_print_first_layer_temperature(1);
@@ -278,8 +281,13 @@ PrintGCode::output()
 
     // Write end commands to file.
     fh << gcodegen.retract(); // TODO: process this retract through PressureRegulator in order to discharge fully
-    for(const auto& end_gcode : config.end_filament_gcode.values) {
-        fh << apply_math(gcodegen.placeholder_parser->process(end_gcode));
+
+    {
+        auto filament_extruder {0U};
+        for(const auto& end_gcode : config.end_filament_gcode.values) {
+            gcodegen.placeholder_parser->set("filament_extruder_id", filament_extruder++);
+            fh << apply_math(gcodegen.placeholder_parser->process(end_gcode));
+        }
     }
 
     fh << apply_math(gcodegen.placeholder_parser->process(config.end_gcode));