diff --git a/Build.PL b/Build.PL
index 8f882fc4b..16e37986a 100644
--- a/Build.PL
+++ b/Build.PL
@@ -38,7 +38,6 @@ if ($gui) {
     %prereqs = qw(
     Class::Accessor                 0
     Wx                              0.9918
-    Socket                          2.016
     );
     %recommends = qw(
     Wx::GLCanvas                    0
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 89e6369e0..8e3d8ad4d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,4 @@
-# Boost 1.63 requires CMake 3.7 or newer
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.2)
 
 project(Slic3r)
 
@@ -23,6 +22,7 @@ option(SLIC3R_GUI    			"Compile Slic3r with GUI components (OpenGL, wxWidgets)"
 option(SLIC3R_PRUSACONTROL		"Compile Slic3r with the PrusaControl prject file format (requires wxWidgets base library)" 1)
 option(SLIC3R_PROFILE 			"Compile Slic3r with an invasive Shiny profiler" 0)
 option(SLIC3R_MSVC_COMPILE_PARALLEL "Compile on Visual Studio in parallel" 1)
+option(SLIC3R_MSVC_PDB          "Generate PDB files on MSVC in Release mode" 1)
 
 if (MSVC AND SLIC3R_MSVC_COMPILE_PARALLEL)
 	add_compile_options(/MP)
@@ -36,10 +36,18 @@ else()
     set(ENV_PATH_SEPARATOR ":")
 endif()
 set(ENV{PATH}     "${PROJECT_SOURCE_DIR}/local-lib/bin${ENV_PATH_SEPARATOR}$ENV{PATH}")
-set(ENV{PERL5LIB} "${PROJECT_SOURCE_DIR}/local-lib/lib/perl${ENV_PATH_SEPARATOR}$ENV{PERL5LIB}")
+set(PERL_INCLUDE  "${PROJECT_SOURCE_DIR}/local-lib/lib/perl5${ENV_PATH_SEPARATOR}$ENV{PERL5LIB}")
 message("PATH: $ENV{PATH}")
-message("PERL5LIB: $ENV{PERL5LIB}")
+message("PERL_INCLUDE: ${PERL_INCLUDE}")
 find_package(Perl REQUIRED)
+if (WIN32)
+    # On Windows passing the PERL5LIB variable causes various problems (such as with MAX_PATH and others),
+    # basically I've found no good way to do it on Windows.
+    set(PERL5LIB_ENV_CMD "")
+else()
+    set(PERL5LIB_ENV_CMD ${CMAKE_COMMAND} -E env PERL5LIB=${PERL_INCLUDE})
+endif()
+
 
 # CMAKE_PREFIX_PATH is used to point CMake to the remaining dependencies (Boost, TBB, ...)
 # We pick it from environment if it is not defined in another way
diff --git a/xs/CMakeLists.txt b/xs/CMakeLists.txt
index be9c7e47b..9f7d586a0 100644
--- a/xs/CMakeLists.txt
+++ b/xs/CMakeLists.txt
@@ -369,7 +369,7 @@ set(MyTypemap ${CMAKE_CURRENT_BINARY_DIR}/typemap)
 add_custom_command(
         OUTPUT ${MyTypemap}
         DEPENDS ${CMAKE_CURRENT_LIST_DIR}/xsp/my.map
-        COMMAND ${PERL_EXECUTABLE} -MExtUtils::Typemaps -MExtUtils::Typemaps::Basic -e "$typemap = ExtUtils::Typemaps->new(file => \"${CMAKE_CURRENT_LIST_DIR}/xsp/my.map\"); $typemap->merge(typemap => ExtUtils::Typemaps::Basic->new); $typemap->write(file => \"${MyTypemap}\")"
+        COMMAND ${PERL5LIB_ENV_CMD} ${PERL_EXECUTABLE} -MExtUtils::Typemaps -MExtUtils::Typemaps::Basic -e "$typemap = ExtUtils::Typemaps->new(file => \"${CMAKE_CURRENT_LIST_DIR}/xsp/my.map\"); $typemap->merge(typemap => ExtUtils::Typemaps::Basic->new); $typemap->write(file => \"${MyTypemap}\")"
         VERBATIM
 )
 
@@ -434,7 +434,8 @@ set(XS_MAIN_CPP ${CMAKE_CURRENT_BINARY_DIR}/XS.cpp)
 add_custom_command(
         OUTPUT ${XS_MAIN_CPP}
         DEPENDS ${MyTypemap} ${XS_XSP_FILES} ${CMAKE_CURRENT_LIST_DIR}/xsp/typemap.xspt
-        COMMAND COMMAND xsubpp -typemap typemap -output ${XS_MAIN_CPP} -hiertype ${XS_MAIN_XS}
+        COMMAND ${PERL5LIB_ENV_CMD} xsubpp -typemap typemap -output ${XS_MAIN_CPP} -hiertype ${XS_MAIN_XS}
+        VERBATIM
 )
 
 # Define the Perl XS shared library.
@@ -498,6 +499,14 @@ if (WIN32)
     target_compile_definitions(XS PRIVATE -DNOGDI -DNOMINMAX -DHAS_BOOL)
 endif ()
 
+# SLIC3R_MSVC_PDB
+if (MSVC AND SLIC3R_MSVC_PDB AND ${CMAKE_BUILD_TYPE} STREQUAL "Release")
+    set_target_properties(XS PROPERTIES
+        COMPILE_FLAGS "/Zi"
+        LINK_FLAGS "/DEBUG /OPT:REF /OPT:ICF"
+    )
+endif()
+
 ## Configuration flags
 if (SLIC3R_GUI)
     message("Slic3r will be built with GUI support")
diff --git a/xs/src/libslic3r/PrintConfig.cpp b/xs/src/libslic3r/PrintConfig.cpp
index d8f2d85a6..a78e73fb5 100644
--- a/xs/src/libslic3r/PrintConfig.cpp
+++ b/xs/src/libslic3r/PrintConfig.cpp
@@ -518,7 +518,7 @@ PrintConfigDef::PrintConfigDef()
     def->cli = "filament-minimal-purge-on-wipe-tower=f@";
     def->sidetext = L("mm³");
     def->min = 0;
-    def->default_value = new ConfigOptionFloats { 5.f };
+    def->default_value = new ConfigOptionFloats { 15.f };
 
     def = this->add("filament_cooling_final_speed", coFloats);
     def->label = L("Speed of the last cooling move");
@@ -572,10 +572,7 @@ PrintConfigDef::PrintConfigDef()
 
     def = this->add("filament_type", coStrings);
     def->label = L("Filament type");
-    def->tooltip = L("If you want to process the output G-code through custom scripts, just list their "
-                   "absolute paths here. Separate multiple scripts with a semicolon. Scripts will be passed "
-                   "the absolute path to the G-code file as the first argument, and they can access "
-                   "the Slic3r config settings by reading environment variables.");
+    def->tooltip = L("The filament material type for use in custom G-codes.");
     def->cli = "filament_type=s@";
     def->gui_type = "f_enum_open";
     def->gui_flags = "show_value";
@@ -921,7 +918,7 @@ PrintConfigDef::PrintConfigDef()
 
     def = this->add("remaining_times", coBool);
     def->label = L("Supports remaining times");
-    def->tooltip = L("Emit M73 P[percent printed] R[remaining time in seconds] at 1 minute"
+    def->tooltip = L("Emit M73 P[percent printed] R[remaining time in minutes] at 1 minute"
                      " intervals into the G-code to let the firmware show accurate remaining time."
                      " As of now only the Prusa i3 MK3 firmware recognizes M73."
                      " Also the i3 MK3 firmware supports M73 Qxx Sxx for the silent mode.");