diff --git a/plugins/XmlMaterialProfile/XmlMaterialProfile.py b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
index 940f88773f..c4912826ee 100644
--- a/plugins/XmlMaterialProfile/XmlMaterialProfile.py
+++ b/plugins/XmlMaterialProfile/XmlMaterialProfile.py
@@ -238,7 +238,8 @@ class XmlMaterialProfile(InstanceContainer):
                 if not variant_containers:
                     continue
 
-                builder.start("hotend", {"id": variant_containers[0]["id"]})
+                # The hotend identifier is not the containers name, but its "name".
+                builder.start("hotend", {"id": variant_containers[0]["name"]})
 
                 # Compatible is a special case, as it's added as a meta data entry (instead of an instance).
                 compatible = hotend.getMetaDataEntry("compatible")
@@ -897,4 +898,4 @@ def _fillMissingVariants():
             Logger.log("w", "Could not find variant for variant-specific material {material_id}.".format(material_id = variant_metadata["id"]))
             continue
         variant_metadata["variant"] = variants[0]["id"]
-ContainerRegistry.allMetadataLoaded.connect(_fillMissingVariants)
\ No newline at end of file
+ContainerRegistry.allMetadataLoaded.connect(_fillMissingVariants)