diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/config/ConfigObject.java b/app/src/main/java/ru/ytkab0bp/slicebeam/config/ConfigObject.java
index e121984..23498f8 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/config/ConfigObject.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/config/ConfigObject.java
@@ -34,6 +34,13 @@ public class ConfigObject implements ProfileListFragment.ProfileListItem {
         this.values.putAll(from.values);
     }
 
+    /**
+     * Note: suitable only from "printer" config
+     */
+    public int getExtruderCount() {
+        return get("nozzle_diameter") != null ? get("nozzle_diameter").replaceAll("[^.]+", "").length() : 1;
+    }
+
     public String get(String key) {
         return values.get(key);
     }
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/PrinterConfigFragment.java b/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/PrinterConfigFragment.java
index d7610a6..be3b761 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/PrinterConfigFragment.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/PrinterConfigFragment.java
@@ -113,7 +113,7 @@ public class PrinterConfigFragment extends ProfileListFragment {
                 // TODO: m_supports_min_feedrates? <= marlin/marlin legacy
         ));
 
-        int count = currentConfig.get("nozzle_diameter") != null ? currentConfig.get("nozzle_diameter").replaceAll("[^.]+", "").length() : 1;
+        int count = currentConfig.getExtruderCount();
         for (int i = 0; i < count; i++) {
             int j = count == 1 ? -1 : i;
             list.addAll(Arrays.asList(
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/ProfileListFragment.java b/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/ProfileListFragment.java
index a4548a6..5c150a7 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/ProfileListFragment.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/fragment/ProfileListFragment.java
@@ -433,6 +433,7 @@ public abstract class ProfileListFragment extends Fragment {
     public void onDestroy() {
         super.onDestroy();
         SliceBeam.EVENT_BUS.unregisterListener(this);
+        unfolded.clear();
     }
 
     @SuppressLint("NotifyDataSetChanged")
@@ -477,7 +478,9 @@ public abstract class ProfileListFragment extends Fragment {
         String v = getCurrentConfig().get(def.key);
         if (i != -1) {
             try {
-                v = v.split(",")[i];
+                String ch = ",";
+                if (def.guiType == ConfigOptionDef.GUIType.COLOR) ch = ";";
+                v = v.split(ch)[i];
             } catch (ArrayIndexOutOfBoundsException e) {
                 Log.w("ProfileListFragment", "Failed to parse mm option", e);
             }
@@ -487,9 +490,11 @@ public abstract class ProfileListFragment extends Fragment {
 
     protected void updateConfigField(ConfigOptionDef def, int i, String value) {
         if (i != -1) {
-            String[] vals = opt(def, -1).split(",");
+            String ch = ",";
+            if (def.guiType == ConfigOptionDef.GUIType.COLOR) ch = ";";
+            String[] vals = opt(def, -1).split(ch);
             vals[i] = value;
-            value = TextUtils.join(",", vals);
+            value = TextUtils.join(ch, vals);
         }
 
         if (!Objects.equals(opt(def, i), value)) {
@@ -697,7 +702,14 @@ public abstract class ProfileListFragment extends Fragment {
                     }
 
                     ref.set(builder.show());
-                });
+                }).setOnLongClickListener(v -> {
+                    new BeamAlertDialogBuilder(getContext())
+                            .setTitle(Slic3rLocalization.getString(def.getFullLabel()))
+                            .setMessage(Slic3rLocalization.getString(def.tooltip))
+                            .setPositiveButton(android.R.string.ok, null)
+                            .show();
+                    return true;
+                });;
 
                 if (def.type == ConfigOptionDef.ConfigOptionType.STRING || def.type == ConfigOptionDef.ConfigOptionType.STRINGS) {
                     ((PreferenceItem) simpleItem).setSubtitleProvider(() -> opt(def, eIndex).trim());
@@ -727,11 +739,23 @@ public abstract class ProfileListFragment extends Fragment {
                 case BOOLS:
                     simpleItem = new PreferenceSwitchItem().setTitle(Slic3rLocalization.getString(def.label))
                             .setValueProvider(() -> "1".equals(opt(def, eIndex)))
-                            .setChangeListener((buttonView, isChecked) -> updateConfigField(def, eIndex, String.valueOf(isChecked ? 1 : 0)));
+                            .setChangeListener((buttonView, isChecked) -> updateConfigField(def, eIndex, String.valueOf(isChecked ? 1 : 0)))
+                            .setLongClickListener(v -> {
+                                new BeamAlertDialogBuilder(getContext())
+                                        .setTitle(Slic3rLocalization.getString(def.getFullLabel()))
+                                        .setMessage(Slic3rLocalization.getString(def.tooltip))
+                                        .setPositiveButton(android.R.string.ok, null)
+                                        .show();
+                                return true;
+                            });
                     break;
             }
         }
 
+        public OptionElement(int specialType) {
+            this.specialType = specialType;
+        }
+
         public OptionElement(int icon, String title) {
             this.icon = icon;
             this.title = title;
@@ -858,7 +882,6 @@ public abstract class ProfileListFragment extends Fragment {
         @Override
         public View onCreateView(Context ctx) {
             FrameLayout v = new FrameLayout(ctx);
-            v.setBackgroundColor(Color.GREEN);
             v.setLayoutParams(new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewUtils.dp(32)) {{
                 bottomMargin = ViewUtils.dp(16);
             }});
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceItem.java b/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceItem.java
index db19466..c3d2daf 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceItem.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceItem.java
@@ -30,6 +30,7 @@ public class PreferenceItem extends SimpleRecyclerItem<PreferenceItem.Preference
     private CharSequence mTitle;
     private ValueProvider mSubtitle;
     private View.OnClickListener onClickListener;
+    private View.OnLongClickListener onLongClickListener;
     private int textColorRes;
     private boolean noTint;
     private ValueProvider valueProvider;
@@ -90,6 +91,11 @@ public class PreferenceItem extends SimpleRecyclerItem<PreferenceItem.Preference
         return this;
     }
 
+    public PreferenceItem setOnLongClickListener(View.OnLongClickListener onLongClickListener) {
+        this.onLongClickListener = onLongClickListener;
+        return this;
+    }
+
     @Override
     public PreferenceHolderView onCreateView(Context ctx) {
         return new PreferenceHolderView(ctx);
@@ -189,6 +195,7 @@ public class PreferenceItem extends SimpleRecyclerItem<PreferenceItem.Preference
             } else {
                 setClickable(false);
             }
+            setOnLongClickListener(item.onLongClickListener);
 
             if (item.textColorRes != 0) {
                 title.setTextColor(ThemesRepo.getColor(item.textColorRes));
diff --git a/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceSwitchItem.java b/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceSwitchItem.java
index 6b71787..7ec324d 100644
--- a/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceSwitchItem.java
+++ b/app/src/main/java/ru/ytkab0bp/slicebeam/recycler/PreferenceSwitchItem.java
@@ -6,6 +6,7 @@ import android.graphics.drawable.Drawable;
 import android.text.TextUtils;
 import android.util.TypedValue;
 import android.view.Gravity;
+import android.view.View;
 import android.view.ViewGroup;
 import android.widget.CompoundButton;
 import android.widget.ImageView;
@@ -28,6 +29,7 @@ public class PreferenceSwitchItem extends SimpleRecyclerItem<PreferenceSwitchIte
     private String mKey;
     private boolean mDefaultValue;
     private CompoundButton.OnCheckedChangeListener mChangeListener;
+    private View.OnLongClickListener mLongClickListener;
     private ValueProvider valueProvider;
 
     public PreferenceSwitchItem setValueProvider(ValueProvider valueProvider) {
@@ -46,6 +48,11 @@ public class PreferenceSwitchItem extends SimpleRecyclerItem<PreferenceSwitchIte
         return this;
     }
 
+    public PreferenceSwitchItem setLongClickListener(View.OnLongClickListener longClickListener) {
+        mLongClickListener = longClickListener;
+        return this;
+    }
+
     public PreferenceSwitchItem setTitle(CharSequence title) {
         mTitle = title;
         return this;
@@ -154,6 +161,7 @@ public class PreferenceSwitchItem extends SimpleRecyclerItem<PreferenceSwitchIte
                     item.mChangeListener.onCheckedChanged(matSwitch, check);
                 }
             });
+            setOnLongClickListener(item.mLongClickListener);
         }
 
         @Override