diff --git a/src/libslic3r/GCode/WipeTower.cpp b/src/libslic3r/GCode/WipeTower.cpp
index 1ac645c931..54c6199ec0 100644
--- a/src/libslic3r/GCode/WipeTower.cpp
+++ b/src/libslic3r/GCode/WipeTower.cpp
@@ -1352,6 +1352,11 @@ std::vector<std::vector<float>> WipeTower::extract_wipe_volumes(const PrintConfi
     // Get wiping matrix to get number of extruders and convert vector<double> to vector<float>:
     std::vector<float> wiping_matrix(cast<float>(config.wiping_volumes_matrix.values));
 
+    // The values shall only be used when SEMM is enabled. The purging for other printers
+    // is determined by filament_minimal_purge_on_wipe_tower.
+    if (! config.single_extruder_multi_material.value)
+        std::fill(wiping_matrix.begin(), wiping_matrix.end(), 0.f);
+
     // Extract purging volumes for each extruder pair:
     std::vector<std::vector<float>> wipe_volumes;
     const unsigned int number_of_extruders = (unsigned int)(sqrt(wiping_matrix.size())+EPSILON);
diff --git a/src/slic3r/GUI/Tab.cpp b/src/slic3r/GUI/Tab.cpp
index d31f48913b..dd138530d8 100644
--- a/src/slic3r/GUI/Tab.cpp
+++ b/src/slic3r/GUI/Tab.cpp
@@ -1122,10 +1122,11 @@ void Tab::update_wiping_button_visibility() {
         return; // ys_FIXME
     bool wipe_tower_enabled = dynamic_cast<ConfigOptionBool*>(  (m_preset_bundle->prints.get_edited_preset().config  ).option("wipe_tower"))->value;
     bool multiple_extruders = dynamic_cast<ConfigOptionFloats*>((m_preset_bundle->printers.get_edited_preset().config).option("nozzle_diameter"))->values.size() > 1;
+    bool single_extruder_multi_material = dynamic_cast<ConfigOptionBool*>((m_preset_bundle->printers.get_edited_preset().config).option("single_extruder_multi_material"))->value;
 
     auto wiping_dialog_button = wxGetApp().sidebar().get_wiping_dialog_button();
     if (wiping_dialog_button) {
-        wiping_dialog_button->Show(wipe_tower_enabled && multiple_extruders);
+        wiping_dialog_button->Show(wipe_tower_enabled && multiple_extruders && single_extruder_multi_material);
         wiping_dialog_button->GetParent()->Layout();
     }
 }