diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index d015ac869..32dddf7dd 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -1963,7 +1963,7 @@ void GCode::_do_export(Print& print, GCodeOutputStream &file, ThumbnailsGenerato
         double                 filament_max_volumetric_speed = m_config.option<ConfigOptionFloats>("filament_max_volumetric_speed")->get_at(initial_extruder_id);
         Flow                   pattern_line                  = Flow(pa_test.line_width(), 0.2, m_config.nozzle_diameter.get_at(0));
         auto                   fast_speed = std::min(print.default_region_config().outer_wall_speed.value, filament_max_volumetric_speed / pattern_line.mm3_per_mm());
-        auto                   slow_speed = std::max(20.0, fast_speed / 10.0);
+        auto                   slow_speed = fast_speed / 4; /*std::max(20.0, fast_speed / 10.0);*/
         pa_test.set_speed(fast_speed, slow_speed);
         pa_test.draw_numbers() = print.calib_params().print_numbers;
         auto params            = print.calib_params();