diff --git a/src/lang_main/model_loader.py b/src/lang_main/model_loader.py
index 7e49250..a00c3d2 100644
--- a/src/lang_main/model_loader.py
+++ b/src/lang_main/model_loader.py
@@ -22,6 +22,7 @@ from lang_main.constants import (
     STFR_SIMILARITY,
 )
 from lang_main.errors import LanguageModelNotFoundError
+from lang_main.loggers import logger_config as logger
 from lang_main.types import (
     LanguageModels,
     Model,
@@ -73,17 +74,19 @@ def load_spacy(
             )
         )
     pretrained_model = cast(SpacyModel, spacy_model_obj.load())
+    logger.info('[MODEL LOADING] Loaded model >>%s<< successfully', model_name)
 
     return pretrained_model
 
 
 def _preprocess_STFR_model_name(
-    model_name: STFRModelTypes,
+    model_name: STFRModelTypes | str,
     backend: STFRBackends,
+    force_download: bool = False,
 ) -> str:
     """utility function to parse specific model names to their
     local file paths per backend
-    necessary for models not present on the Huggingface Hub (like
+    necessary for models not present on the Hugging Face Hub (like
     own pretrained or optimised models)
     only if chosen model and backend in combination are defined a local
     file path is generated
@@ -94,6 +97,9 @@ def _preprocess_STFR_model_name(
         model name given by configuration
     backend: STFRBackends
         backend given by configuration
+    force_download: bool
+        try to download model even if it is configured as local,
+        by default: False
 
     Returns
     -------
@@ -102,7 +108,9 @@ def _preprocess_STFR_model_name(
     """
     combination = (model_name, backend)
     model_name_or_path: str
-    if combination in STFR_CUSTOM_MODELS and STFR_CUSTOM_MODELS[combination]:
+    if force_download:
+        model_name_or_path = model_name
+    elif combination in STFR_CUSTOM_MODELS and STFR_CUSTOM_MODELS[combination]:
         # !! defined that each model is placed in a folder with its model name
         # !! without any user names
         folder_name = model_name.split('/')[-1]
@@ -119,7 +127,7 @@ def _preprocess_STFR_model_name(
 
 
 def load_sentence_transformer(
-    model_name: STFRModelTypes,
+    model_name: STFRModelTypes | str,
     similarity_func: SimilarityFunction = SimilarityFunction.COSINE,
     backend: STFRBackends = STFRBackends.TORCH,
     device: STFRDeviceTypes = STFRDeviceTypes.CPU,
@@ -127,10 +135,12 @@ def load_sentence_transformer(
     trust_remote_code: bool = False,
     model_save_folder: str | None = None,
     model_kwargs: STFRModelArgs | dict[str, Any] | None = None,
+    force_download: bool = False,
 ) -> SentenceTransformer:
-    model_name_or_path = _preprocess_STFR_model_name(model_name=model_name, backend=backend)
-
-    return SentenceTransformer(
+    model_name_or_path = _preprocess_STFR_model_name(
+        model_name=model_name, backend=backend, force_download=force_download
+    )
+    model = SentenceTransformer(
         model_name_or_path=model_name_or_path,
         similarity_fn_name=similarity_func,
         backend=backend,  # type: ignore Literal matches Enum
@@ -140,6 +150,9 @@ def load_sentence_transformer(
         trust_remote_code=trust_remote_code,
         model_kwargs=model_kwargs,  # type: ignore
     )
+    logger.info('[MODEL LOADING] Loaded model >>%s<< successfully', model_name)
+
+    return model
 
 
 # ** configured model builder functions
@@ -147,7 +160,7 @@ MODEL_LOADER_MAP: Final[ModelLoaderMap] = {
     LanguageModels.SENTENCE_TRANSFORMER: {
         'func': load_sentence_transformer,
         'kwargs': {
-            'model_name_or_path': STFR_MODEL_NAME,
+            'model_name': STFR_MODEL_NAME,
             'similarity_func': STFR_SIMILARITY,
             'backend': STFR_BACKEND,
             'device': STFR_DEVICE,
diff --git a/src/lang_main/types.py b/src/lang_main/types.py
index b10a585..eeec036 100644
--- a/src/lang_main/types.py
+++ b/src/lang_main/types.py
@@ -65,8 +65,9 @@ class SpacyModelTypes(enum.StrEnum):
     DE_DEP_NEWS_TRF = 'de_dep_news_trf'
 
 
-class STFRQuantFilenames(enum.StrEnum):
+class STFRONNXFilenames(enum.StrEnum):
     ONNX_Q_UINT8 = 'onnx/model_quint8_avx2.onnx'
+    ONNX_OPT_O3 = 'onnx/model_O3.onnx'
 
 
 TorchDTypes: TypeAlias = Literal[
@@ -79,7 +80,7 @@ TorchDTypes: TypeAlias = Literal[
 class STFRModelArgs(TypedDict):
     torch_dtype: NotRequired[TorchDTypes]
     provider: NotRequired[ONNXExecutionProvider]
-    file_name: NotRequired[STFRQuantFilenames]
+    file_name: NotRequired[STFRONNXFilenames]
     export: NotRequired[bool]