diff --git a/invokeai/backend/model_manager/configs/factory.py b/invokeai/backend/model_manager/configs/factory.py
index 03ab40ca5a..7be18014aa 100644
--- a/invokeai/backend/model_manager/configs/factory.py
+++ b/invokeai/backend/model_manager/configs/factory.py
@@ -457,15 +457,7 @@ class ModelConfigFactory:
         # Now do any post-processing needed for specific model types/bases/etc.
         match instance.type:
             case ModelType.Main:
-                match instance.base:
-                    case BaseModelType.StableDiffusion1:
-                        instance.default_settings = MainModelDefaultSettings(width=512, height=512)
-                    case BaseModelType.StableDiffusion2:
-                        instance.default_settings = MainModelDefaultSettings(width=768, height=768)
-                    case BaseModelType.StableDiffusionXL:
-                        instance.default_settings = MainModelDefaultSettings(width=1024, height=1024)
-                    case _:
-                        pass
+                instance.default_settings = MainModelDefaultSettings.from_base(instance.base)
             case ModelType.ControlNet | ModelType.T2IAdapter | ModelType.ControlLoRa:
                 instance.default_settings = ControlAdapterDefaultSettings.from_model_name(instance.name)
             case ModelType.LoRA:
diff --git a/invokeai/backend/model_manager/configs/main.py b/invokeai/backend/model_manager/configs/main.py
index cb09a0c884..dcb948d99b 100644
--- a/invokeai/backend/model_manager/configs/main.py
+++ b/invokeai/backend/model_manager/configs/main.py
@@ -51,6 +51,19 @@ class MainModelDefaultSettings(BaseModel):
 
     model_config = ConfigDict(extra="forbid")
 
+    @classmethod
+    def from_base(cls, base: BaseModelType) -> Self | None:
+        match base:
+            case BaseModelType.StableDiffusion1:
+                return cls(width=512, height=512)
+            case BaseModelType.StableDiffusion2:
+                return cls(width=768, height=768)
+            case BaseModelType.StableDiffusionXL:
+                return cls(width=1024, height=1024)
+            case _:
+                # TODO(psyche): Do we want defaults for other base types?
+                return None
+
 
 class Main_Config_Base(ABC, BaseModel):
     type: Literal[ModelType.Main] = Field(default=ModelType.Main)