diff --git a/klippy/configfile.py b/klippy/configfile.py
index 954a3ca3..6701d7cd 100644
--- a/klippy/configfile.py
+++ b/klippy/configfile.py
@@ -4,6 +4,7 @@
 #
 # This file may be distributed under the terms of the GNU GPLv3 license.
 import sys, os, glob, re, time, logging, configparser, io
+from sharedlib import *
 
 error = configparser.Error
 
@@ -281,10 +282,9 @@ class PrinterConfig:
         filename = self.printer.get_start_args()['config_file']
         data = self._read_config_file(filename)
         regular_data, autosave_data = self._find_autosave_data(data)
-        regular_config = self._build_config_wrapper(regular_data, filename)
-        autosave_data = self._strip_duplicates(autosave_data, regular_config)
+        autosave_data = Klippy_Autosave_Read()
         self.autosave = self._build_config_wrapper(autosave_data, filename)
-        cfg = self._build_config_wrapper(regular_data + autosave_data, filename)
+        cfg = self._build_config_wrapper(regular_data + "\n" + autosave_data, filename)
         return cfg
     def check_unused_options(self, config):
         fileconfig = config.fileconfig
@@ -369,14 +369,6 @@ class PrinterConfig:
             del pending[section]
             self.status_save_pending = pending
             self.save_config_pending = True
-    def _disallow_include_conflicts(self, regular_data, cfgname, gcode):
-        config = self._build_config_wrapper(regular_data, cfgname)
-        for section in self.autosave.fileconfig.sections():
-            for option in self.autosave.fileconfig.options(section):
-                if config.fileconfig.has_option(section, option):
-                    msg = ("SAVE_CONFIG section '%s' option '%s' conflicts "
-                           "with included value" % (section, option))
-                    raise gcode.error(msg)
     cmd_SAVE_CONFIG_help = "Overwrite config file and restart"
     def cmd_SAVE_CONFIG(self, gcmd):
         if not self.autosave.fileconfig.sections():
@@ -384,45 +376,15 @@ class PrinterConfig:
         gcode = self.printer.lookup_object('gcode')
         # Create string containing autosave data
         autosave_data = self._build_config_string(self.autosave)
-        lines = [('#*# ' + l).strip()
-                 for l in autosave_data.split('\n')]
-        lines.insert(0, "\n" + AUTOSAVE_HEADER.rstrip())
-        lines.append("")
-        autosave_data = '\n'.join(lines)
-        # Read in and validate current config file
-        cfgname = self.printer.get_start_args()['config_file']
-        try:
-            data = self._read_config_file(cfgname)
-            regular_data, old_autosave_data = self._find_autosave_data(data)
-            config = self._build_config_wrapper(regular_data, cfgname)
-        except error as e:
-            msg = "Unable to parse existing config on SAVE_CONFIG"
-            logging.exception(msg)
-            raise gcode.error(msg)
-        regular_data = self._strip_duplicates(regular_data, self.autosave)
-        self._disallow_include_conflicts(regular_data, cfgname, gcode)
-        data = regular_data.rstrip() + autosave_data
-        # Determine filenames
-        datestr = time.strftime("-%Y%m%d_%H%M%S")
-        backup_name = cfgname + datestr
-        temp_name = cfgname + "_autosave"
-        if cfgname.endswith(".cfg"):
-            backup_name = cfgname[:-4] + datestr + ".cfg"
-            temp_name = cfgname[:-4] + "_autosave.cfg"
-        # Create new config file with temporary name and swap with main config
-        logging.info("SAVE_CONFIG to '%s' (backup in '%s')",
-                     cfgname, backup_name)
-        try:
-            f = open(temp_name, 'w')
-            f.write(data)
-            f.close()
-            if gcmd.get_int('BACKUP', 1):
-                os.rename(cfgname, backup_name)
-            os.rename(temp_name, cfgname)
-        except:
-            msg = "Unable to write config file during SAVE_CONFIG"
+
+        logging.info("SAVE_CONFIG to '%s' (backup: +'.backup_' +time)",
+                     Klippy_Get_Autosave_Filename())
+        ok = Klippy_Autosave_Write(autosave_data)
+        if not ok:
+            msg = "Unable to write config file during SAVE_CONFIG (check logs)"
             logging.exception(msg)
             raise gcode.error(msg)
+
         # Request a restart
         if gcmd.get_int('RESTART', 1):
             gcode.request_restart('restart')
diff --git a/klippy/klippy.py b/klippy/klippy.py
index 23338d87..a801b8f7 100644
--- a/klippy/klippy.py
+++ b/klippy/klippy.py
@@ -8,6 +8,9 @@ import sys, os, gc, optparse, logging, time, collections, importlib
 import util, reactor, queuelogger, msgproto
 import gcode, configfile, pins, mcu, toolhead, webhooks, tcp_server
 
+import sharedlib
+sharedlib.load()
+
 message_ready = "Printer is ready"
 
 message_startup = """
diff --git a/klippy/sharedlib.py b/klippy/sharedlib.py
new file mode 100644
index 00000000..c99a93a3
--- /dev/null
+++ b/klippy/sharedlib.py
@@ -0,0 +1,40 @@
+import sys, os, gc, optparse, logging, time
+from cffi import FFI
+import datetime
+
+SCREEN_PATH="/home/pi/3dscreen"
+
+ffi = FFI()
+lib = None
+
+def load():
+    global lib
+
+    ffi.cdef("""
+        char* Klippy_Get_Autosave_Filename();
+        char* Klippy_Autosave_Read();
+        bool Klippy_Autosave_Write(char*);
+        void free(void*);
+    """)
+
+    try:
+        lib = ffi.dlopen(SCREEN_PATH+"/lib/lib3dscreen.so")
+    except:
+        lib = ffi.dlopen("/lib/lib3dscreen-host.so")
+
+def Klippy_Get_Autosave_Filename():
+    res = lib.Klippy_Get_Autosave_Filename()
+    s = ffi.string(res).decode("utf-8")
+    lib.free(res)
+    return s
+
+def Klippy_Autosave_Read():
+    res = lib.Klippy_Autosave_Read()
+    s = ffi.string(res).decode("utf-8")
+    lib.free(res)
+    return s
+
+def Klippy_Autosave_Write(data):
+    b = data.encode('utf-8')
+    res = lib.Klippy_Autosave_Write(b)
+    return res