diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index ff0a7c027..116fcbe7f 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -2807,7 +2807,7 @@ std::string GCode::_extrude(const ExtrusionPath &path, std::string description,
     gcode += this->unretract();
 
     // adjust acceleration
-    {
+    if (m_config.default_acceleration.value > 0) {
         double acceleration;
         if (this->on_first_layer() && m_config.first_layer_acceleration.value > 0) {
             acceleration = m_config.first_layer_acceleration.value;
diff --git a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
index d45a2e613..614e83811 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoHollow.cpp
@@ -621,7 +621,7 @@ RENDER_AGAIN:
     ImGui::PushItemWidth(window_width - diameter_slider_left);
 
     float diam = 2.f * m_new_hole_radius;
-    m_imgui->slider_float("##hole_diameter", &diam, 1.f, 15.f, "%.1f mm", 1.f, false);
+    m_imgui->slider_float("##hole_diameter", &diam, 1.f, 25.f, "%.1f mm", 1.f, false);
     // Let's clamp the value (which could have been entered by keyboard) to a larger range
     // than the slider. This allows entering off-scale values and still protects against
     //complete non-sense.
diff --git a/src/slic3r/GUI/PresetHints.cpp b/src/slic3r/GUI/PresetHints.cpp
index 5c5ed2612..ce709d9eb 100644
--- a/src/slic3r/GUI/PresetHints.cpp
+++ b/src/slic3r/GUI/PresetHints.cpp
@@ -34,11 +34,17 @@ std::string PresetHints::cooling_description(const Preset &preset)
                               "so that no less than %3%s are spent on that layer "
                               "(however, speed will never be reduced below %4%mm/s)."),
                               slowdown_below_layer_time, max_fan_speed, slowdown_below_layer_time, min_print_speed);
-        if (fan_below_layer_time > slowdown_below_layer_time)
-            out += "\n" + 
-                GUI::format(_L("If estimated layer time is greater, but still below ~%1%s, "
+        if (fan_below_layer_time > slowdown_below_layer_time) {
+            out += "\n";
+            if (min_fan_speed != max_fan_speed)
+                out += GUI::format(_L("If estimated layer time is greater, but still below ~%1%s, "
                                "fan will run at a proportionally decreasing speed between %2%%% and %3%%%."),
                                fan_below_layer_time, max_fan_speed, min_fan_speed);
+            else
+                out += GUI::format(_L("If estimated layer time is greater, but still below ~%1%s, "
+                               "fan will run at %2%%%"),
+                               fan_below_layer_time, min_fan_speed);
+        }
         out += "\n";
     }
 	if (preset.config.opt_bool("fan_always_on", 0)) {