diff --git a/docs/api/slicing.rst b/docs/api/slicing.rst
index 7edabe8f..5204da15 100644
--- a/docs/api/slicing.rst
+++ b/docs/api/slicing.rst
@@ -110,7 +110,7 @@ List Slicing Profiles of a Specific Slicer
 
    :param slicer:   The identifying key of the slicer for which to list the available profiles.
    :statuscode 200: No error
-   :statuscode 404: If the ``slicer`` was unknown to the system.
+   :statuscode 404: If the ``slicer`` was unknown to the system or not yet configured.
 
 .. _sec-api-slicing-listspecific:
 
@@ -155,7 +155,7 @@ Retrieve Specific Profile
    :param slicer:   The identifying key of the slicer for which to list the available profiles.
    :param name:     The identifying key of the profile to retrieve
    :statuscode 200: No error
-   :statuscode 404: If the ``slicer`` or the profile was unknown to the system.
+   :statuscode 404: If the ``slicer`` or the profile ``key`` was unknown to the system.
 
 .. _sec-api-slicing-add:
 
@@ -215,7 +215,8 @@ Delete Slicing Profile
 
 .. http:delete:: /api/slicing/(string:slicer)/profiles/(string:key)
 
-   Delete the slicing profile identified by ``key`` for the slicer ``slicer``.
+   Delete the slicing profile identified by ``key`` for the slicer ``slicer``. If the profile doesn't exist, the
+   request will succeed anyway.
 
    :param slicer:   The identifying key of the slicer for which to delete the profile
    :param key:      The identifying key of the profile to delete
diff --git a/src/octoprint/server/api/slicing.py b/src/octoprint/server/api/slicing.py
index 4ad45e06..a1237f40 100644
--- a/src/octoprint/server/api/slicing.py
+++ b/src/octoprint/server/api/slicing.py
@@ -89,11 +89,10 @@ def slicingAddSlicerProfile(slicer, name):
 		description = json_data["description"]
 
 	try:
-		profile = slicingManager.save_profile(slicer, name, data, display_name=display_name, description=description)
+		profile = slicingManager.save_profile(slicer, name, data,
+		                                      allow_overwrite=True, display_name=display_name, description=description)
 	except UnknownSlicer:
 		return make_response("Unknown slicer {slicer}".format(**locals()), 404)
-	except ProfileAlreadyExists:
-		return make_response("A profile named {name} already exists for slicer {slicer}".format(**locals()), 409)
 
 	result = _getSlicingProfileData(slicer, name, profile)
 	r = make_response(jsonify(result), 201)
@@ -137,10 +136,8 @@ def slicingPatchSlicerProfile(slicer, name):
 		s().set(["slicing", "defaultProfiles"], default_profiles)
 		s().save(force=True)
 
-	try:
-		saved_profile = slicingManager.save_profile(slicer, name, profile, overrides=data, display_name=display_name, description=description)
-	except ProfileAlreadyExists:
-		return make_response("Profile named {name} for slicer {slicer} does already exist".format(**locals()), 409)
+	saved_profile = slicingManager.save_profile(slicer, name, profile,
+	                                            allow_overwrite=True, overrides=data, display_name=display_name, description=description)
 	return jsonify(_getSlicingProfileData(slicer, name, saved_profile))
 
 @api.route("/slicing/<string:slicer>/profiles/<string:name>", methods=["DELETE"])
@@ -150,8 +147,6 @@ def slicingDelSlicerProfile(slicer, name):
 		slicingManager.delete_profile(slicer, name)
 	except UnknownSlicer:
 		return make_response("Unknown slicer {slicer}".format(**locals()), 404)
-	except UnknownProfile:
-		return make_response("Unknown profile {name} for slicer {slicer}".format(**locals()), 404)
 
 	return NO_CONTENT
 
diff --git a/src/octoprint/slicing/__init__.py b/src/octoprint/slicing/__init__.py
index 083e5611..ab86c421 100644
--- a/src/octoprint/slicing/__init__.py
+++ b/src/octoprint/slicing/__init__.py
@@ -434,7 +434,7 @@ class SlicingManager(object):
 			raise ValueError("name must be set")
 
 		try:
-			path = self.get_profile_path(slicer, name)
+			path = self.get_profile_path(slicer, name, must_exist=True)
 		except UnknownProfile:
 			return
 		os.remove(path)