diff --git a/spoolman/api/v1/filament.py b/spoolman/api/v1/filament.py
index 6d8251e..bea135b 100644
--- a/spoolman/api/v1/filament.py
+++ b/spoolman/api/v1/filament.py
@@ -73,8 +73,13 @@ class FilamentUpdateParameters(FilamentParameters):
     description="Get a list of filaments that matches the search query.",
     response_model_exclude_none=True,
 )
-async def find(_vendor: Union[int, None] = None) -> list[Filament]:
-    return []
+async def find(
+    vendor_id: Optional[int] = None,
+    name: Optional[str] = None,
+    material: Optional[str] = None,
+    article_number: Optional[str] = None,
+) -> list[Filament]:
+    return []  # TODO: Implement
 
 
 @router.get(
diff --git a/spoolman/api/v1/spool.py b/spoolman/api/v1/spool.py
index 72b7a55..b9e11a3 100644
--- a/spoolman/api/v1/spool.py
+++ b/spoolman/api/v1/spool.py
@@ -63,8 +63,15 @@ class SpoolUseParameters(BaseModel):
     description="Get a list of spools that matches the search query.",
     response_model_exclude_none=True,
 )
-async def find(_filament: Union[int, None] = None) -> list[Spool]:
-    return []
+async def find(
+    filament_id: Optional[int] = None,
+    name: Optional[str] = None,
+    material: Optional[str] = None,
+    vendor: Optional[str] = None,
+    location: Optional[str] = None,
+    lot_nr: Optional[str] = None,
+) -> list[Spool]:
+    return []  # TODO: Implement
 
 
 @router.get(
diff --git a/spoolman/api/v1/vendor.py b/spoolman/api/v1/vendor.py
index 1a76055..5e261f4 100644
--- a/spoolman/api/v1/vendor.py
+++ b/spoolman/api/v1/vendor.py
@@ -44,8 +44,8 @@ class VendorUpdateParameters(VendorParameters):
     description="Get a list of vendors that matches the search query.",
     response_model_exclude_none=True,
 )
-async def find(_name: Union[int, None] = None) -> list[Vendor]:
-    return []
+async def find(name: Optional[str] = None) -> list[Vendor]:
+    return []  # TODO: Implement
 
 
 @router.get(