diff --git a/src/octoprint/plugins/cura/__init__.py b/src/octoprint/plugins/cura/__init__.py
index 5fd933fb..8713c377 100644
--- a/src/octoprint/plugins/cura/__init__.py
+++ b/src/octoprint/plugins/cura/__init__.py
@@ -17,6 +17,7 @@ import octoprint.slicing
 import octoprint.settings
 
 from octoprint.util.paths import normalize as normalize_path
+from octoprint.util import to_unicode
 
 from .profile import Profile
 from .profile import GcodeFlavors
@@ -236,7 +237,8 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 
 		self._save_profile(path, new_profile, allow_overwrite=allow_overwrite)
 
-	def do_slice(self, model_path, printer_profile, machinecode_path=None, profile_path=None, position=None, on_progress=None, on_progress_args=None, on_progress_kwargs=None):
+	def do_slice(self, model_path, printer_profile, machinecode_path=None, profile_path=None, position=None,
+	             on_progress=None, on_progress_args=None, on_progress_kwargs=None):
 		try:
 			with self._job_mutex:
 				if not profile_path:
@@ -258,7 +260,10 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 					if not on_progress_kwargs:
 						on_progress_kwargs = dict()
 
-				self._cura_logger.info(u"### Slicing %s to %s using profile stored at %s" % (model_path, machinecode_path, profile_path))
+				self._cura_logger.info(u"### Slicing {} to {} using profile stored at {}"
+				                       .format(to_unicode(model_path, errors="replace"),
+				                               to_unicode(machinecode_path, errors="replace"),
+				                               to_unicode(profile_path, errors="replace")))
 
 				executable = normalize_path(self._settings.get(["cura_engine"]))
 				if not executable:
@@ -293,7 +298,9 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 					args += ["-s", "%s=%s" % (k, str(v))]
 				args += ["-o", machinecode_path, model_path]
 
-				self._logger.info(u"Running %r in %s" % (" ".join(args), working_dir))
+				self._logger.info(u"Running {!r} in {}".format(u" ".join(map(lambda x: to_unicode(x, errors="replace"),
+				                                                             args)),
+				                                               working_dir))
 
 				import sarge
 				p = sarge.run(args, cwd=working_dir, async=True, stdout=sarge.Capture(), stderr=sarge.Capture())
@@ -314,7 +321,7 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 						p.commands[0].poll()
 						continue
 
-					line = octoprint.util.to_unicode(line, errors="replace")
+					line = to_unicode(line, errors="replace")
 					self._cura_logger.debug(line.strip())
 
 					if on_progress is not None:
@@ -437,7 +444,8 @@ class CuraPlugin(octoprint.plugin.SlicerPlugin,
 				command = self._slicing_commands[machinecode_path]
 				if command is not None:
 					command.terminate()
-				self._logger.info(u"Cancelled slicing of %s" % machinecode_path)
+				self._logger.info(u"Cancelled slicing of {}"
+				                  .format(to_unicode(machinecode_path, errors="replace")))
 
 	def _load_profile(self, path):
 		import yaml