diff --git a/Build.PL b/Build.PL
index 0f340a585..0e5113456 100644
--- a/Build.PL
+++ b/Build.PL
@@ -34,7 +34,7 @@ my $xs_only = grep { $_ eq '--xs' }  @ARGV;
 if ($gui) {
     %prereqs = qw(
     Class::Accessor                 0
-    Wx                              0.9918
+    Wx                              3.0
     Socket                          2.016
     );
     %recommends = qw(
diff --git a/lib/Slic3r/GUI.pm b/lib/Slic3r/GUI.pm
index cf2729c92..56007b44c 100644
--- a/lib/Slic3r/GUI.pm
+++ b/lib/Slic3r/GUI.pm
@@ -74,7 +74,6 @@ our $Settings = {
     },
 };
 
-our $have_button_icons = &Wx::wxVERSION_STRING =~ m" (?:2\.9\.[1-9]|3\.)";
 our $small_font = Wx::SystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
 $small_font->SetPointSize(11) if &Wx::wxMAC;
 our $small_bold_font = Wx::SystemSettings::GetFont(wxSYS_DEFAULT_GUI_FONT);
@@ -92,7 +91,7 @@ sub OnInit {
     my ($self) = @_;
     
     $self->SetAppName('Slic3r');
-    $self->SetAppDisplayName('Slic3r Prusa Edition') if (Wx::wxVERSION >= 3.000000);
+    $self->SetAppDisplayName('Slic3r Prusa Edition');
     Slic3r::debugf "wxWidgets version %s, Wx version %s\n", &Wx::wxVERSION_STRING, $Wx::VERSION;
     
     $self->{notifier} = Slic3r::GUI::Notifier->new;
diff --git a/lib/Slic3r/GUI/3DScene.pm b/lib/Slic3r/GUI/3DScene.pm
index 68de5518b..6276af425 100644
--- a/lib/Slic3r/GUI/3DScene.pm
+++ b/lib/Slic3r/GUI/3DScene.pm
@@ -943,22 +943,12 @@ sub mouse_to_3d {
 
 sub GetContext {
     my ($self) = @_;
-    
-    if (Wx::wxVERSION >= 2.009) {
-        return $self->{context} ||= Wx::GLContext->new($self);
-    } else {
-        return $self->SUPER::GetContext;
-    }
+    return $self->{context} ||= Wx::GLContext->new($self);
 }
  
 sub SetCurrent {
     my ($self, $context) = @_;
-    
-    if (Wx::wxVERSION >= 2.009) {
-        return $self->SUPER::SetCurrent($context);
-    } else {
-        return $self->SUPER::SetCurrent;
-    }
+    return $self->SUPER::SetCurrent($context);
 }
 
 sub UseVBOs {
diff --git a/lib/Slic3r/GUI/Controller/ManualControlDialog.pm b/lib/Slic3r/GUI/Controller/ManualControlDialog.pm
index 39aff02bf..8dcc05424 100644
--- a/lib/Slic3r/GUI/Controller/ManualControlDialog.pm
+++ b/lib/Slic3r/GUI/Controller/ManualControlDialog.pm
@@ -34,10 +34,8 @@ sub new {
         my $btn = Wx::Button->new($self, -1, $label, wxDefaultPosition, wxDefaultSize,
             wxBU_LEFT | wxBU_EXACTFIT);
         $btn->SetFont($bold ? $Slic3r::GUI::small_bold_font : $Slic3r::GUI::small_font);
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("$icon.png"), wxBITMAP_TYPE_PNG));
-            $btn->SetBitmapPosition($pos);
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("$icon.png"), wxBITMAP_TYPE_PNG));
+        $btn->SetBitmapPosition($pos);
         EVT_BUTTON($self, $btn, $handler);
         $sizer->Add($btn, 1, wxEXPAND | wxALL, 0);
     };
diff --git a/lib/Slic3r/GUI/Controller/PrinterPanel.pm b/lib/Slic3r/GUI/Controller/PrinterPanel.pm
index fa5910a14..6dba614e3 100644
--- a/lib/Slic3r/GUI/Controller/PrinterPanel.pm
+++ b/lib/Slic3r/GUI/Controller/PrinterPanel.pm
@@ -127,9 +127,7 @@ sub new {
         {
             $self->{btn_disconnect} = my $btn = Wx::Button->new($box, -1, "Disconnect", wxDefaultPosition, wxDefaultSize);
             $btn->SetFont($Slic3r::GUI::small_font);
-            if ($Slic3r::GUI::have_button_icons) {
-                $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("delete.png"), wxBITMAP_TYPE_PNG));
-            }
+            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("delete.png"), wxBITMAP_TYPE_PNG));
             $serial_speed_sizer->Add($btn, 0, wxLEFT, 5);
             EVT_BUTTON($self, $btn, \&disconnect);
         }
@@ -142,9 +140,7 @@ sub new {
         my $font = $btn->GetFont;
         $font->SetPointSize($font->GetPointSize + 2);
         $btn->SetFont($font);
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("arrow_up.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("arrow_up.png"), wxBITMAP_TYPE_PNG));
         $left_sizer->Add($btn, 0, wxTOP, 15);
         EVT_BUTTON($self, $btn, \&connect);
     }
@@ -164,9 +160,7 @@ sub new {
     {
         $self->{btn_manual_control} = my $btn = Wx::Button->new($box, -1, "Manual control", wxDefaultPosition, wxDefaultSize);
         $btn->SetFont($Slic3r::GUI::small_font);
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("cog.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("cog.png"), wxBITMAP_TYPE_PNG));
         $btn->Hide;
         $left_sizer->Add($btn, 0, wxTOP, 15);
         EVT_BUTTON($self, $btn, sub {
@@ -583,9 +577,7 @@ sub new {
         $btn->SetToolTipString("Delete this job from print queue")
             if $btn->can('SetToolTipString');
         $btn->SetFont($Slic3r::GUI::small_font);
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("delete.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("delete.png"), wxBITMAP_TYPE_PNG));
         if ($job->printing) {
             $btn->Hide;
         }
@@ -605,11 +597,9 @@ sub new {
         my $btn = $self->{btn_print} = Wx::Button->new($self, -1, $label, wxDefaultPosition, wxDefaultSize,
             $button_style);
         $btn->SetFont($Slic3r::GUI::small_bold_font);
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_play.png"), wxBITMAP_TYPE_PNG));
-            $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_play_blue.png"), wxBITMAP_TYPE_PNG));
-            #$btn->SetBitmapPosition(wxRIGHT);
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_play.png"), wxBITMAP_TYPE_PNG));
+        $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_play_blue.png"), wxBITMAP_TYPE_PNG));
+        #$btn->SetBitmapPosition(wxRIGHT);
         $btn->Hide;
         $buttons_sizer->Add($btn, 0, wxBOTTOM, 2);
         
@@ -626,10 +616,8 @@ sub new {
         if (!$job->printing || $job->paused) {
             $btn->Hide;
         }
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_pause.png"), wxBITMAP_TYPE_PNG));
-            $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_pause_blue.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_pause.png"), wxBITMAP_TYPE_PNG));
+        $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_pause_blue.png"), wxBITMAP_TYPE_PNG));
         $buttons_sizer->Add($btn, 0, wxBOTTOM, 2);
         
         EVT_BUTTON($self, $btn, sub {
@@ -645,10 +633,8 @@ sub new {
         if (!$job->printing || !$job->paused) {
             $btn->Hide;
         }
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_play.png"), wxBITMAP_TYPE_PNG));
-            $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_play_blue.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_play.png"), wxBITMAP_TYPE_PNG));
+        $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_play_blue.png"), wxBITMAP_TYPE_PNG));
         $buttons_sizer->Add($btn, 0, wxBOTTOM, 2);
         
         EVT_BUTTON($self, $btn, sub {
@@ -664,10 +650,8 @@ sub new {
         if (!$job->printing) {
             $btn->Hide;
         }
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_stop.png"), wxBITMAP_TYPE_PNG));
-            $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_stop_blue.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("control_stop.png"), wxBITMAP_TYPE_PNG));
+        $btn->SetBitmapCurrent(Wx::Bitmap->new($Slic3r::var->("control_stop_blue.png"), wxBITMAP_TYPE_PNG));
         $buttons_sizer->Add($btn, 0, wxBOTTOM, 2);
         
         EVT_BUTTON($self, $btn, sub {
diff --git a/lib/Slic3r/GUI/MainFrame.pm b/lib/Slic3r/GUI/MainFrame.pm
index e15868fb6..b01f3dd4e 100644
--- a/lib/Slic3r/GUI/MainFrame.pm
+++ b/lib/Slic3r/GUI/MainFrame.pm
@@ -398,7 +398,6 @@ sub quick_slice {
             print_center    => $print_center,
             status_cb       => sub {
                 my ($percent, $message) = @_;
-                return if &Wx::wxVERSION_STRING !~ m" 2\.(8\.|9\.[2-9])";
                 $progress_dialog->Update($percent, "$message…");
             },
         );
diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index 91dca96b9..24373dc5a 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -235,30 +235,28 @@ sub new {
     $self->{btn_print}->Hide;
     $self->{btn_send_gcode}->Hide;
     
-    if ($Slic3r::GUI::have_button_icons) {
-        my %icons = qw(
-            add             brick_add.png
-            remove          brick_delete.png
-            reset           cross.png
-            arrange         bricks.png
-            export_gcode    cog_go.png
-            print           arrow_up.png
-            send_gcode      arrow_up.png
-            reslice         reslice.png
-            export_stl      brick_go.png
-            
-            increase        add.png
-            decrease        delete.png
-            rotate45cw      arrow_rotate_clockwise.png
-            rotate45ccw     arrow_rotate_anticlockwise.png
-            changescale     arrow_out.png
-            split           shape_ungroup.png
-            cut             package.png
-            settings        cog.png
-        );
-        for (grep $self->{"btn_$_"}, keys %icons) {
-            $self->{"btn_$_"}->SetBitmap(Wx::Bitmap->new($Slic3r::var->($icons{$_}), wxBITMAP_TYPE_PNG));
-        }
+    my %icons = qw(
+        add             brick_add.png
+        remove          brick_delete.png
+        reset           cross.png
+        arrange         bricks.png
+        export_gcode    cog_go.png
+        print           arrow_up.png
+        send_gcode      arrow_up.png
+        reslice         reslice.png
+        export_stl      brick_go.png
+        
+        increase        add.png
+        decrease        delete.png
+        rotate45cw      arrow_rotate_clockwise.png
+        rotate45ccw     arrow_rotate_anticlockwise.png
+        changescale     arrow_out.png
+        split           shape_ungroup.png
+        cut             package.png
+        settings        cog.png
+    );
+    for (grep $self->{"btn_$_"}, keys %icons) {
+        $self->{"btn_$_"}->SetBitmap(Wx::Bitmap->new($Slic3r::var->($icons{$_}), wxBITMAP_TYPE_PNG));
     }
     $self->selection_changed(0);
     $self->object_list_changed;
@@ -1401,7 +1399,7 @@ sub export_gcode {
     if ($output_file) {
         $self->{export_gcode_output_file} = $self->{print}->output_filepath($output_file);
     } else {
-        my $default_output_file = $self->{print}->output_filepath($main::opt{output});
+        my $default_output_file = $self->{print}->output_filepath($main::opt{output} // '');
         my $dlg = Wx::FileDialog->new($self, 'Save G-code file as:', wxTheApp->output_path(dirname($default_output_file)),
             basename($default_output_file), &Slic3r::GUI::FILE_WILDCARDS->{gcode}, wxFD_SAVE | wxFD_OVERWRITE_PROMPT);
         if ($dlg->ShowModal != wxID_OK) {
diff --git a/lib/Slic3r/GUI/Plater/2DToolpaths.pm b/lib/Slic3r/GUI/Plater/2DToolpaths.pm
index 9e3f11129..e48793bb0 100644
--- a/lib/Slic3r/GUI/Plater/2DToolpaths.pm
+++ b/lib/Slic3r/GUI/Plater/2DToolpaths.pm
@@ -583,22 +583,12 @@ sub InitGL {
 
 sub GetContext {
     my ($self) = @_;
-    
-    if (Wx::wxVERSION >= 2.009) {
-        return $self->{context} ||= Wx::GLContext->new($self);
-    } else {
-        return $self->SUPER::GetContext;
-    }
+    return $self->{context} ||= Wx::GLContext->new($self);
 }
  
 sub SetCurrent {
     my ($self, $context) = @_;
-    
-    if (Wx::wxVERSION >= 2.009) {
-        return $self->SUPER::SetCurrent($context);
-    } else {
-        return $self->SUPER::SetCurrent;
-    }
+    return $self->SUPER::SetCurrent($context);
 }
 
 sub Resize {
diff --git a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
index a3aaae400..a8628a634 100644
--- a/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectPartsPanel.pm
@@ -57,17 +57,15 @@ sub new {
     $self->{btn_load_lambda_modifier} = Wx::Button->new($self, -1, "Load generic…", wxDefaultPosition, wxDefaultSize, wxBU_LEFT);
     $self->{btn_delete} = Wx::Button->new($self, -1, "Delete part", wxDefaultPosition, wxDefaultSize, wxBU_LEFT);
     $self->{btn_split} = Wx::Button->new($self, -1, "Split part", wxDefaultPosition, wxDefaultSize, wxBU_LEFT);
-    $self->{btn_move_up} = Wx::Button->new($self, -1, $Slic3r::GUI::have_button_icons ? "" : "Up", wxDefaultPosition, [40, -1], wxBU_LEFT);
-    $self->{btn_move_down} = Wx::Button->new($self, -1, $Slic3r::GUI::have_button_icons ? "" : "Down", wxDefaultPosition, [40, -1], wxBU_LEFT);
-    if ($Slic3r::GUI::have_button_icons) {
-        $self->{btn_load_part}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_add.png"), wxBITMAP_TYPE_PNG));
-        $self->{btn_load_modifier}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_add.png"), wxBITMAP_TYPE_PNG));
-        $self->{btn_load_lambda_modifier}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_add.png"), wxBITMAP_TYPE_PNG));
-        $self->{btn_delete}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_delete.png"), wxBITMAP_TYPE_PNG));
-        $self->{btn_split}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("shape_ungroup.png"), wxBITMAP_TYPE_PNG));
-        $self->{btn_move_up}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("bullet_arrow_up.png"), wxBITMAP_TYPE_PNG));
-        $self->{btn_move_down}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("bullet_arrow_down.png"), wxBITMAP_TYPE_PNG));
-    }
+    $self->{btn_move_up} = Wx::Button->new($self, -1, "", wxDefaultPosition, [40, -1], wxBU_LEFT);
+    $self->{btn_move_down} = Wx::Button->new($self, -1, "", wxDefaultPosition, [40, -1], wxBU_LEFT);
+    $self->{btn_load_part}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_add.png"), wxBITMAP_TYPE_PNG));
+    $self->{btn_load_modifier}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_add.png"), wxBITMAP_TYPE_PNG));
+    $self->{btn_load_lambda_modifier}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_add.png"), wxBITMAP_TYPE_PNG));
+    $self->{btn_delete}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("brick_delete.png"), wxBITMAP_TYPE_PNG));
+    $self->{btn_split}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("shape_ungroup.png"), wxBITMAP_TYPE_PNG));
+    $self->{btn_move_up}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("bullet_arrow_up.png"), wxBITMAP_TYPE_PNG));
+    $self->{btn_move_down}->SetBitmap(Wx::Bitmap->new($Slic3r::var->("bullet_arrow_down.png"), wxBITMAP_TYPE_PNG));
     
     # buttons sizer
     my $buttons_sizer = Wx::GridSizer->new(2, 3);
diff --git a/lib/Slic3r/GUI/Plater/ObjectSettingsDialog.pm b/lib/Slic3r/GUI/Plater/ObjectSettingsDialog.pm
index d86765d5f..e8f6b938e 100644
--- a/lib/Slic3r/GUI/Plater/ObjectSettingsDialog.pm
+++ b/lib/Slic3r/GUI/Plater/ObjectSettingsDialog.pm
@@ -90,7 +90,7 @@ sub new {
     $sizer->Add($grid, 1, wxEXPAND | wxALL, 10);
     $grid->CreateGrid(0, 3);
     $grid->DisableDragRowSize;
-    $grid->HideRowLabels if &Wx::wxVERSION_STRING !~ / 2\.8\./;
+    $grid->HideRowLabels;
     $grid->SetColLabelValue(0, "Min Z (mm)");
     $grid->SetColLabelValue(1, "Max Z (mm)");
     $grid->SetColLabelValue(2, "Layer height (mm)");
diff --git a/lib/Slic3r/GUI/Tab.pm b/lib/Slic3r/GUI/Tab.pm
index 33b7a7752..c2de563e2 100644
--- a/lib/Slic3r/GUI/Tab.pm
+++ b/lib/Slic3r/GUI/Tab.pm
@@ -1252,9 +1252,7 @@ sub build {
         my $btn = Wx::Button->new($parent, -1, "Set…", wxDefaultPosition, wxDefaultSize,
             wxBU_LEFT | wxBU_EXACTFIT);
         $btn->SetFont($Slic3r::GUI::small_font);
-        if ($Slic3r::GUI::have_button_icons) {
-            $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("cog.png"), wxBITMAP_TYPE_PNG));
-        }
+        $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("cog.png"), wxBITMAP_TYPE_PNG));
         
         my $sizer = Wx::BoxSizer->new(wxHORIZONTAL);
         $sizer->Add($btn);
@@ -1335,9 +1333,7 @@ sub build {
                 my $btn = $self->{serial_test_btn} = Wx::Button->new($parent, -1,
                     "Test", wxDefaultPosition, wxDefaultSize, wxBU_LEFT | wxBU_EXACTFIT);
                 $btn->SetFont($Slic3r::GUI::small_font);
-                if ($Slic3r::GUI::have_button_icons) {
-                    $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("wrench.png"), wxBITMAP_TYPE_PNG));
-                }
+                $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("wrench.png"), wxBITMAP_TYPE_PNG));
                 
                 EVT_BUTTON($self, $btn, sub {
                     my $sender = Slic3r::GCode::Sender->new;
@@ -1367,9 +1363,7 @@ sub build {
                 
                 my $btn = Wx::Button->new($parent, -1, "Browse…", wxDefaultPosition, wxDefaultSize, wxBU_LEFT);
                 $btn->SetFont($Slic3r::GUI::small_font);
-                if ($Slic3r::GUI::have_button_icons) {
-                    $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("zoom.png"), wxBITMAP_TYPE_PNG));
-                }
+                $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("zoom.png"), wxBITMAP_TYPE_PNG));
                 
                 if (!eval "use Net::Bonjour; 1") {
                     $btn->Disable;
@@ -1405,9 +1399,7 @@ sub build {
                 my $btn = $self->{octoprint_host_test_btn} = Wx::Button->new($parent, -1,
                     "Test", wxDefaultPosition, wxDefaultSize, wxBU_LEFT | wxBU_EXACTFIT);
                 $btn->SetFont($Slic3r::GUI::small_font);
-                if ($Slic3r::GUI::have_button_icons) {
-                    $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("wrench.png"), wxBITMAP_TYPE_PNG));
-                }
+                $btn->SetBitmap(Wx::Bitmap->new($Slic3r::var->("wrench.png"), wxBITMAP_TYPE_PNG));
                 
                 EVT_BUTTON($self, $btn, sub {
                     my $ua = LWP::UserAgent->new;