diff --git a/plugins/3MFReader/ThreeMFReader.py b/plugins/3MFReader/ThreeMFReader.py
index e9f0e28511..0f4ab532fa 100644
--- a/plugins/3MFReader/ThreeMFReader.py
+++ b/plugins/3MFReader/ThreeMFReader.py
@@ -118,7 +118,7 @@ class ThreeMFReader(MeshReader):
             Job.yieldThread()
 
         # TODO: We currently do not check for normals and simply recalculate them.
-        mesh_builder.calculateNormals()
+        mesh_builder.calculateNormals(fast=True)
         mesh_builder.setFileName(name)
         mesh_data = mesh_builder.build()