diff --git a/lib/Slic3r/Print/Object.pm b/lib/Slic3r/Print/Object.pm
index 3d0d56cdb..e7fe54623 100644
--- a/lib/Slic3r/Print/Object.pm
+++ b/lib/Slic3r/Print/Object.pm
@@ -645,25 +645,4 @@ sub combine_infill {
     }
 }
 
-# Used by t/support.t and by GCode.pm to export support line width as a comment.
-# To be removed.
-sub support_material_flow {
-    my ($self, $role) = @_;
-    
-    $role //= FLOW_ROLE_SUPPORT_MATERIAL;
-    my $extruder = ($role == FLOW_ROLE_SUPPORT_MATERIAL)
-        ? $self->config->support_material_extruder
-        : $self->config->support_material_interface_extruder;
-    
-    # we use a bogus layer_height because we use the same flow for all
-    # support material layers
-    return Slic3r::Flow->new_from_width(
-        width               => $self->config->support_material_extrusion_width || $self->config->extrusion_width,
-        role                => $role,
-        nozzle_diameter     => $self->print->config->nozzle_diameter->[$extruder-1] // $self->print->config->nozzle_diameter->[0],
-        layer_height        => $self->config->layer_height,
-        bridge_flow_ratio   => 0,
-    );
-}
-
 1;
diff --git a/t/support.t b/t/support.t
index 11945997c..e30571c09 100644
--- a/t/support.t
+++ b/t/support.t
@@ -12,6 +12,7 @@ BEGIN {
 
 use List::Util qw(first);
 use Slic3r;
+use Slic3r::Flow ':roles';
 use Slic3r::Geometry qw(epsilon scale);
 use Slic3r::Geometry::Clipper qw(diff);
 use Slic3r::Test;
@@ -23,7 +24,14 @@ use Slic3r::Test;
     
     my $test = sub {
         my $print = Slic3r::Test::init_print('20mm_cube', config => $config);
-        my $flow = $print->print->objects->[0]->support_material_flow;
+        my $object_config = $print->print->objects->[0]->config;
+        my $flow = Slic3r::Flow->new_from_width(
+            width               => $object_config->support_material_extrusion_width || $object_config->extrusion_width,
+            role                => FLOW_ROLE_SUPPORT_MATERIAL,
+            nozzle_diameter     => $print->config->nozzle_diameter->[$object_config->support_material_extruder-1] // $print->config->nozzle_diameter->[0],
+            layer_height        => $object_config->layer_height,
+            bridge_flow_ratio   => 0,
+        );
         my $support = Slic3r::Print::SupportMaterial->new(
             object_config       => $print->print->objects->[0]->config,
             print_config        => $print->print->config,