diff --git a/resources/profiles/Original Prusa i3 MK2, MK2S, MK2MM and MK3.ini b/resources/profiles/Original Prusa i3 MK2, MK2S, MK2MM and MK3.ini
index 5835cfdeb..64af7d9b2 100644
--- a/resources/profiles/Original Prusa i3 MK2, MK2S, MK2MM and MK3.ini	
+++ b/resources/profiles/Original Prusa i3 MK2, MK2S, MK2MM and MK3.ini	
@@ -1,4 +1,4 @@
-# generated by Slic3r Prusa Edition 1.39.0 on 2018-01-06 at 15:09:55
+# generated by Slic3r Prusa Edition 1.39.0.29-prusa3d-win64 on 2018-01-22 at 14:53:14
 
 [print:0.05mm DETAIL]
 avoid_crossing_perimeters = 0
@@ -532,7 +532,7 @@ xy_size_compensation = 0
 
 [print:0.10mm DETAIL MK3]
 avoid_crossing_perimeters = 0
-bottom_solid_layers = 4
+bottom_solid_layers = 7
 bridge_acceleration = 1000
 bridge_angle = 0
 bridge_flow_ratio = 0.8
@@ -563,17 +563,17 @@ first_layer_height = 0.2
 first_layer_speed = 30
 gap_fill_speed = 40
 gcode_comments = 0
-infill_acceleration = 3500
+infill_acceleration = 1500
 infill_every_layers = 1
 infill_extruder = 1
 infill_extrusion_width = 0.45
 infill_first = 0
 infill_only_where_needed = 0
 infill_overlap = 25%
-infill_speed = 200
+infill_speed = 170
 interface_shells = 0
 layer_height = 0.1
-max_print_speed = 250
+max_print_speed = 170
 max_volumetric_extrusion_rate_slope_negative = 0
 max_volumetric_extrusion_rate_slope_positive = 0
 max_volumetric_speed = 0
@@ -601,7 +601,7 @@ solid_infill_below_area = 0
 solid_infill_every_layers = 0
 solid_infill_extruder = 1
 solid_infill_extrusion_width = 0.45
-solid_infill_speed = 200
+solid_infill_speed = 170
 spiral_vase = 0
 standby_temperature_delta = -5
 support_material = 0
@@ -627,8 +627,8 @@ thin_walls = 0
 threads = 4
 top_infill_extrusion_width = 0.4
 top_solid_infill_speed = 50
-top_solid_layers = 5
-travel_speed = 250
+top_solid_layers = 9
+travel_speed = 170
 wipe_tower = 0
 wipe_tower_per_color_wipe = 15
 wipe_tower_width = 60
@@ -1062,7 +1062,7 @@ xy_size_compensation = 0
 
 [print:0.15mm OPTIMAL MK3]
 avoid_crossing_perimeters = 0
-bottom_solid_layers = 4
+bottom_solid_layers = 5
 bridge_acceleration = 1000
 bridge_angle = 0
 bridge_flow_ratio = 0.8
@@ -1093,17 +1093,17 @@ first_layer_height = 0.2
 first_layer_speed = 30
 gap_fill_speed = 40
 gcode_comments = 0
-infill_acceleration = 3500
+infill_acceleration = 1500
 infill_every_layers = 1
 infill_extruder = 1
 infill_extrusion_width = 0.45
 infill_first = 0
 infill_only_where_needed = 0
 infill_overlap = 25%
-infill_speed = 200
+infill_speed = 170
 interface_shells = 0
 layer_height = 0.15
-max_print_speed = 250
+max_print_speed = 170
 max_volumetric_extrusion_rate_slope_negative = 0
 max_volumetric_extrusion_rate_slope_positive = 0
 max_volumetric_speed = 0
@@ -1131,7 +1131,7 @@ solid_infill_below_area = 0
 solid_infill_every_layers = 0
 solid_infill_extruder = 1
 solid_infill_extrusion_width = 0.45
-solid_infill_speed = 200
+solid_infill_speed = 170
 spiral_vase = 0
 standby_temperature_delta = -5
 support_material = 0
@@ -1157,8 +1157,8 @@ thin_walls = 0
 threads = 4
 top_infill_extrusion_width = 0.4
 top_solid_infill_speed = 50
-top_solid_layers = 5
-travel_speed = 250
+top_solid_layers = 7
+travel_speed = 170
 wipe_tower = 1
 wipe_tower_per_color_wipe = 15
 wipe_tower_width = 60
@@ -1517,17 +1517,17 @@ first_layer_height = 0.2
 first_layer_speed = 30
 gap_fill_speed = 40
 gcode_comments = 0
-infill_acceleration = 3500
+infill_acceleration = 1500
 infill_every_layers = 1
 infill_extruder = 1
 infill_extrusion_width = 0.45
 infill_first = 0
 infill_only_where_needed = 0
 infill_overlap = 25%
-infill_speed = 200
+infill_speed = 170
 interface_shells = 0
 layer_height = 0.2
-max_print_speed = 250
+max_print_speed = 170
 max_volumetric_extrusion_rate_slope_negative = 0
 max_volumetric_extrusion_rate_slope_positive = 0
 max_volumetric_speed = 0
@@ -1555,7 +1555,7 @@ solid_infill_below_area = 0
 solid_infill_every_layers = 0
 solid_infill_extruder = 1
 solid_infill_extrusion_width = 0.45
-solid_infill_speed = 200
+solid_infill_speed = 170
 spiral_vase = 0
 standby_temperature_delta = -5
 support_material = 0
@@ -1582,7 +1582,7 @@ threads = 4
 top_infill_extrusion_width = 0.4
 top_solid_infill_speed = 50
 top_solid_layers = 5
-travel_speed = 250
+travel_speed = 170
 wipe_tower = 1
 wipe_tower_per_color_wipe = 15
 wipe_tower_width = 60
@@ -2807,13 +2807,13 @@ filament_settings_id =
 filament_soluble = 0
 filament_type = PET
 first_layer_bed_temperature = 90
-first_layer_temperature = 260
-max_fan_speed = 80
-min_fan_speed = 80
+first_layer_temperature = 275
+max_fan_speed = 50
+min_fan_speed = 50
 min_print_speed = 5
 slowdown_below_layer_time = 20
 start_filament_gcode = "M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{else}45{endif}; Filament gcode"
-temperature = 260
+temperature = 275
 
 [filament:Fillamentum Timberfil]
 bed_temperature = 60
@@ -3120,19 +3120,19 @@ filament_colour = #00CA0A
 filament_cost = 0
 filament_density = 0
 filament_diameter = 1.75
-filament_max_volumetric_speed = 2.5
+filament_max_volumetric_speed = 1.5
 filament_notes = "List of materials tested with FLEX print settings & FLEX material settings for MK2:\n\nFillamentum Flex 98A\nFillamentum Flex 92A\nPlasty Mladeč PP\nPlasty Mladeč TPE32 \nPlasty Mladeč TPE88"
 filament_settings_id = 
 filament_soluble = 0
 filament_type = FLEX
 first_layer_bed_temperature = 50
-first_layer_temperature = 220
+first_layer_temperature = 240
 max_fan_speed = 90
 min_fan_speed = 70
 min_print_speed = 5
 slowdown_below_layer_time = 20
 start_filament_gcode = "M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{else}10{endif}; Filament gcode"
-temperature = 230
+temperature = 240
 
 [filament:Taulman Bridge]
 bed_temperature = 50
@@ -3560,7 +3560,7 @@ retract_speed = 35
 serial_port = 
 serial_speed = 250000
 single_extruder_multi_material = 0
-start_gcode = M115 U3.1.1-RC4 ; tell printer latest fw version\nM201 X1000 Y1000 Z200 E5000 ; sets maximum accelerations, mm/sec^2\nM203 X500 Y500 Z12 E120 ; sets maximum feedrates, mm/sec\nM204 S1250 T1250 ; sets acceleration (S) and retract acceleration (T)\nM205 X15 Y15 Z0.4 E2.5 ; sets the jerk limits, mm/sec\nM205 S0 T0 ; sets the minimum extruding and travel feed rate, mm/sec\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG1 Y-3.0 F1000.0 ; go outside print area\nG92 E0.0\nG1 X60.0 E9.0  F1000.0 ; intro line\nG1 X100.0 E12.5  F1000.0 ; intro line\nG92 E0.0\nM221 S95
+start_gcode = M115 U3.1.1-RC5 ; tell printer latest fw version\nM201 X1000 Y1000 Z200 E5000 ; sets maximum accelerations, mm/sec^2\nM203 X200 Y200 Z12 E120 ; sets maximum feedrates, mm/sec\nM204 S1250 T1250 ; sets acceleration (S) and retract acceleration (T)\nM205 X10 Y10 Z0.4 E2.5 ; sets the jerk limits, mm/sec\nM205 S0 T0 ; sets the minimum extruding and travel feed rate, mm/sec\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG1 Y-3.0 F1000.0 ; go outside print area\nG92 E0.0\nG1 X60.0 E9.0  F1000.0 ; intro line\nG1 X100.0 E12.5  F1000.0 ; intro line\nG92 E0.0\nM221 S{if layer_height==0.05}100{else}95{endif}
 toolchange_gcode = 
 use_firmware_retraction = 0
 use_relative_e_distances = 1
diff --git a/resources/profiles/Original Prusa i3 MK3.ini b/resources/profiles/Original Prusa i3 MK3.ini
index 0afbb35cd..b53006b0f 100644
--- a/resources/profiles/Original Prusa i3 MK3.ini	
+++ b/resources/profiles/Original Prusa i3 MK3.ini	
@@ -1,4 +1,4 @@
-# generated by Slic3r Prusa Edition 1.39.0 on 2018-01-06 at 15:12:34
+# generated by Slic3r Prusa Edition 1.39.0 on 2018-02-02 at 10:48:46
 
 [print:0.05mm DETAIL]
 avoid_crossing_perimeters = 0
@@ -532,7 +532,7 @@ xy_size_compensation = 0
 
 [print:0.10mm DETAIL MK3]
 avoid_crossing_perimeters = 0
-bottom_solid_layers = 4
+bottom_solid_layers = 7
 bridge_acceleration = 1000
 bridge_angle = 0
 bridge_flow_ratio = 0.8
@@ -563,17 +563,17 @@ first_layer_height = 0.2
 first_layer_speed = 30
 gap_fill_speed = 40
 gcode_comments = 0
-infill_acceleration = 3500
+infill_acceleration = 1500
 infill_every_layers = 1
 infill_extruder = 1
 infill_extrusion_width = 0.45
 infill_first = 0
 infill_only_where_needed = 0
 infill_overlap = 25%
-infill_speed = 200
+infill_speed = 170
 interface_shells = 0
 layer_height = 0.1
-max_print_speed = 250
+max_print_speed = 170
 max_volumetric_extrusion_rate_slope_negative = 0
 max_volumetric_extrusion_rate_slope_positive = 0
 max_volumetric_speed = 0
@@ -601,7 +601,7 @@ solid_infill_below_area = 0
 solid_infill_every_layers = 0
 solid_infill_extruder = 1
 solid_infill_extrusion_width = 0.45
-solid_infill_speed = 200
+solid_infill_speed = 170
 spiral_vase = 0
 standby_temperature_delta = -5
 support_material = 0
@@ -627,8 +627,8 @@ thin_walls = 0
 threads = 4
 top_infill_extrusion_width = 0.4
 top_solid_infill_speed = 50
-top_solid_layers = 5
-travel_speed = 250
+top_solid_layers = 9
+travel_speed = 170
 wipe_tower = 0
 wipe_tower_per_color_wipe = 15
 wipe_tower_width = 60
@@ -1062,7 +1062,7 @@ xy_size_compensation = 0
 
 [print:0.15mm OPTIMAL MK3]
 avoid_crossing_perimeters = 0
-bottom_solid_layers = 4
+bottom_solid_layers = 5
 bridge_acceleration = 1000
 bridge_angle = 0
 bridge_flow_ratio = 0.8
@@ -1093,17 +1093,17 @@ first_layer_height = 0.2
 first_layer_speed = 30
 gap_fill_speed = 40
 gcode_comments = 0
-infill_acceleration = 3500
+infill_acceleration = 1500
 infill_every_layers = 1
 infill_extruder = 1
 infill_extrusion_width = 0.45
 infill_first = 0
 infill_only_where_needed = 0
 infill_overlap = 25%
-infill_speed = 200
+infill_speed = 170
 interface_shells = 0
 layer_height = 0.15
-max_print_speed = 250
+max_print_speed = 170
 max_volumetric_extrusion_rate_slope_negative = 0
 max_volumetric_extrusion_rate_slope_positive = 0
 max_volumetric_speed = 0
@@ -1131,7 +1131,7 @@ solid_infill_below_area = 0
 solid_infill_every_layers = 0
 solid_infill_extruder = 1
 solid_infill_extrusion_width = 0.45
-solid_infill_speed = 200
+solid_infill_speed = 170
 spiral_vase = 0
 standby_temperature_delta = -5
 support_material = 0
@@ -1157,8 +1157,8 @@ thin_walls = 0
 threads = 4
 top_infill_extrusion_width = 0.4
 top_solid_infill_speed = 50
-top_solid_layers = 5
-travel_speed = 250
+top_solid_layers = 7
+travel_speed = 170
 wipe_tower = 1
 wipe_tower_per_color_wipe = 15
 wipe_tower_width = 60
@@ -1517,17 +1517,17 @@ first_layer_height = 0.2
 first_layer_speed = 30
 gap_fill_speed = 40
 gcode_comments = 0
-infill_acceleration = 3500
+infill_acceleration = 1500
 infill_every_layers = 1
 infill_extruder = 1
 infill_extrusion_width = 0.45
 infill_first = 0
 infill_only_where_needed = 0
 infill_overlap = 25%
-infill_speed = 200
+infill_speed = 170
 interface_shells = 0
 layer_height = 0.2
-max_print_speed = 250
+max_print_speed = 170
 max_volumetric_extrusion_rate_slope_negative = 0
 max_volumetric_extrusion_rate_slope_positive = 0
 max_volumetric_speed = 0
@@ -1555,7 +1555,7 @@ solid_infill_below_area = 0
 solid_infill_every_layers = 0
 solid_infill_extruder = 1
 solid_infill_extrusion_width = 0.45
-solid_infill_speed = 200
+solid_infill_speed = 170
 spiral_vase = 0
 standby_temperature_delta = -5
 support_material = 0
@@ -1582,7 +1582,7 @@ threads = 4
 top_infill_extrusion_width = 0.4
 top_solid_infill_speed = 50
 top_solid_layers = 5
-travel_speed = 250
+travel_speed = 170
 wipe_tower = 1
 wipe_tower_per_color_wipe = 15
 wipe_tower_width = 60
@@ -2807,13 +2807,13 @@ filament_settings_id =
 filament_soluble = 0
 filament_type = PET
 first_layer_bed_temperature = 90
-first_layer_temperature = 260
-max_fan_speed = 80
-min_fan_speed = 80
+first_layer_temperature = 275
+max_fan_speed = 50
+min_fan_speed = 50
 min_print_speed = 5
 slowdown_below_layer_time = 20
 start_filament_gcode = "M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{else}45{endif}; Filament gcode"
-temperature = 260
+temperature = 275
 
 [filament:Fillamentum Timberfil]
 bed_temperature = 60
@@ -3120,19 +3120,19 @@ filament_colour = #00CA0A
 filament_cost = 0
 filament_density = 0
 filament_diameter = 1.75
-filament_max_volumetric_speed = 2.5
+filament_max_volumetric_speed = 1.5
 filament_notes = "List of materials tested with FLEX print settings & FLEX material settings for MK2:\n\nFillamentum Flex 98A\nFillamentum Flex 92A\nPlasty Mladeč PP\nPlasty Mladeč TPE32 \nPlasty Mladeč TPE88"
 filament_settings_id = 
 filament_soluble = 0
 filament_type = FLEX
 first_layer_bed_temperature = 50
-first_layer_temperature = 220
+first_layer_temperature = 240
 max_fan_speed = 90
 min_fan_speed = 70
 min_print_speed = 5
 slowdown_below_layer_time = 20
 start_filament_gcode = "M900 K{if printer_notes=~/.*PRINTER_HAS_BOWDEN.*/}200{else}10{endif}; Filament gcode"
-temperature = 230
+temperature = 240
 
 [filament:Taulman Bridge]
 bed_temperature = 50
@@ -3280,7 +3280,7 @@ retract_speed = 35
 serial_port = 
 serial_speed = 250000
 single_extruder_multi_material = 0
-start_gcode = M115 U3.1.1-RC4 ; tell printer latest fw version\nM201 X1000 Y1000 Z200 E5000 ; sets maximum accelerations, mm/sec^2\nM203 X500 Y500 Z12 E120 ; sets maximum feedrates, mm/sec\nM204 S1250 T1250 ; sets acceleration (S) and retract acceleration (T)\nM205 X15 Y15 Z0.4 E2.5 ; sets the jerk limits, mm/sec\nM205 S0 T0 ; sets the minimum extruding and travel feed rate, mm/sec\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG1 Y-3.0 F1000.0 ; go outside print area\nG92 E0.0\nG1 X60.0 E9.0  F1000.0 ; intro line\nG1 X100.0 E12.5  F1000.0 ; intro line\nG92 E0.0\nM221 S95
+start_gcode = M115 U3.1.1-RC5 ; tell printer latest fw version\nM201 X1000 Y1000 Z200 E5000 ; sets maximum accelerations, mm/sec^2\nM203 X200 Y200 Z12 E120 ; sets maximum feedrates, mm/sec\nM204 S1250 T1250 ; sets acceleration (S) and retract acceleration (T)\nM205 X10 Y10 Z0.4 E2.5 ; sets the jerk limits, mm/sec\nM205 S0 T0 ; sets the minimum extruding and travel feed rate, mm/sec\nM83  ; extruder relative mode\nM104 S[first_layer_temperature] ; set extruder temp\nM140 S[first_layer_bed_temperature] ; set bed temp\nM190 S[first_layer_bed_temperature] ; wait for bed temp\nM109 S[first_layer_temperature] ; wait for extruder temp\nG28 W ; home all without mesh bed level\nG80 ; mesh bed leveling\nG1 Y-3.0 F1000.0 ; go outside print area\nG92 E0.0\nG1 X60.0 E9.0  F1000.0 ; intro line\nG1 X100.0 E12.5  F1000.0 ; intro line\nG92 E0.0\nM221 S{if layer_height==0.05}100{else}95{endif}
 toolchange_gcode = 
 use_firmware_retraction = 0
 use_relative_e_distances = 1
diff --git a/t/custom_gcode.t b/t/custom_gcode.t
index 6a930a38a..bafcd4610 100644
--- a/t/custom_gcode.t
+++ b/t/custom_gcode.t
@@ -1,4 +1,4 @@
-use Test::More tests => 71;
+use Test::More tests => 77;
 use strict;
 use warnings;
 
@@ -91,8 +91,14 @@ use Slic3r::Test;
     is $parser->evaluate_boolean_expression('(12 == 2 * 6) ? (1 - 1 == 3) : (2 * 2 == 4)'),  0, 'boolean expression parser: ternary true';
     is $parser->evaluate_boolean_expression('12 < 3'), 0, 'boolean expression parser: lower than - false';
     is $parser->evaluate_boolean_expression('12 < 22'), 1, 'boolean expression parser: lower than - true';
-    is $parser->evaluate_boolean_expression('12 > 3'), 1, 'boolean expression parser: lower than - true';
-    is $parser->evaluate_boolean_expression('12 > 22'), 0, 'boolean expression parser: lower than - false';
+    is $parser->evaluate_boolean_expression('12 > 3'), 1, 'boolean expression parser: greater than - true';
+    is $parser->evaluate_boolean_expression('12 > 22'), 0, 'boolean expression parser: greater than - false';
+    is $parser->evaluate_boolean_expression('12 <= 3'), 0, 'boolean expression parser: lower than or equal- false';
+    is $parser->evaluate_boolean_expression('12 <= 22'), 1, 'boolean expression parser: lower than or equal - true';
+    is $parser->evaluate_boolean_expression('12 >= 3'), 1, 'boolean expression parser: greater than or equal - true';
+    is $parser->evaluate_boolean_expression('12 >= 22'), 0, 'boolean expression parser: greater than or equal - false';
+    is $parser->evaluate_boolean_expression('12 <= 12'), 1, 'boolean expression parser: lower than or equal (same values) - true';
+    is $parser->evaluate_boolean_expression('12 >= 12'), 1, 'boolean expression parser: greater than or equal (same values) - true';
 
     is $parser->evaluate_boolean_expression('printer_notes=~/.*PRINTER_VENDOR_PRUSA3D.*/ and printer_notes=~/.*PRINTER_MODEL_MK2.*/ and nozzle_diameter[0]==0.6 and num_extruders>1'), 1, 'complex expression';
     is $parser->evaluate_boolean_expression('printer_notes=~/.*PRINTER_VEwerfNDOR_PRUSA3D.*/ or printer_notes=~/.*PRINTertER_MODEL_MK2.*/ or (nozzle_diameter[0]==0.6 and num_extruders>1)'), 1, 'complex expression2';
diff --git a/xs/src/libslic3r/PerimeterGenerator.cpp b/xs/src/libslic3r/PerimeterGenerator.cpp
index bffd46d0f..ea9c73fa4 100644
--- a/xs/src/libslic3r/PerimeterGenerator.cpp
+++ b/xs/src/libslic3r/PerimeterGenerator.cpp
@@ -483,8 +483,9 @@ PerimeterGenerator::_variable_width(const ThickPolylines &polylines, ExtrusionRo
             if (path.polyline.points.empty()) {
                 path.polyline.append(line.a);
                 path.polyline.append(line.b);
-                
-                flow.width = unscale(w);
+                // Convert from spacing to extrusion width based on the extrusion model
+                // of a square extrusion ended with semi circles.
+                flow.width = unscale(w) + flow.height * (1. - 0.25 * PI);
                 #ifdef SLIC3R_DEBUG
                 printf("  filling %f gap\n", flow.width);
                 #endif
diff --git a/xs/src/libslic3r/PlaceholderParser.cpp b/xs/src/libslic3r/PlaceholderParser.cpp
index b91f4c99c..ba0efd6e4 100644
--- a/xs/src/libslic3r/PlaceholderParser.cpp
+++ b/xs/src/libslic3r/PlaceholderParser.cpp
@@ -974,10 +974,10 @@ namespace client
 
             relational_expression = 
                     additive_expression(_r1)                [_val  = _1]
-                >> *(   (lit('<') > additive_expression(_r1) ) [px::bind(&expr<Iterator>::lower,   _val, _1)]
-                    |   (lit('>') > additive_expression(_r1) ) [px::bind(&expr<Iterator>::greater, _val, _1)]
-                    |   ("<="     > additive_expression(_r1) ) [px::bind(&expr<Iterator>::leq,     _val, _1)]
+                >> *(   ("<="     > additive_expression(_r1) ) [px::bind(&expr<Iterator>::leq,     _val, _1)]
                     |   (">="     > additive_expression(_r1) ) [px::bind(&expr<Iterator>::geq,     _val, _1)]
+                    |   (lit('<') > additive_expression(_r1) ) [px::bind(&expr<Iterator>::lower,   _val, _1)]
+                    |   (lit('>') > additive_expression(_r1) ) [px::bind(&expr<Iterator>::greater, _val, _1)]
                     );
             relational_expression.name("relational_expression");
 
diff --git a/xs/src/libslic3r/PrintConfig.cpp b/xs/src/libslic3r/PrintConfig.cpp
index 0dc6c9d43..5bbf20c4c 100644
--- a/xs/src/libslic3r/PrintConfig.cpp
+++ b/xs/src/libslic3r/PrintConfig.cpp
@@ -200,10 +200,10 @@ PrintConfigDef::PrintConfigDef()
     def->default_value = new ConfigOptionFloat(6);
 
     def = this->add("elefant_foot_compensation", coFloat);
-    def->label = "Elefant foot compensation";
+    def->label = "Elephant foot compensation";
     def->category = "Advanced";
     def->tooltip = "The first layer will be shrunk in the XY plane by the configured value "
-                   "to compensate for the 1st layer squish aka an Elefant Foot effect.";
+                   "to compensate for the 1st layer squish aka an Elephant Foot effect.";
     def->sidetext = "mm";
     def->cli = "elefant-foot-compensation=f";
     def->min = 0;
diff --git a/xs/xsp/GUI_Preset.xsp b/xs/xsp/GUI_Preset.xsp
index 67e1d5fc6..0033ebd0e 100644
--- a/xs/xsp/GUI_Preset.xsp
+++ b/xs/xsp/GUI_Preset.xsp
@@ -18,8 +18,8 @@
     bool                        is_compatible_with_printer(Preset *active_printer)
         %code%{ RETVAL = THIS->is_compatible_with_printer(*active_printer); %};
 
-    const char*                 name()          %code%{ RETVAL = THIS->name.c_str(); %};
-    const char*                 file()          %code%{ RETVAL = THIS->file.c_str(); %};
+    std::string                 name()          %code%{ RETVAL = THIS->name; %};
+    std::string                 file()          %code%{ RETVAL = THIS->file; %};
 
     bool                        loaded()        %code%{ RETVAL = THIS->loaded;      %};