Right-click a MeshInstance3D and choose Edit in Blender. Each save updates the node's mesh. Any objects you add in Blender come back as child nodes, keeping their hierarchy and origins, which makes hinged doors and similar parts easy. .blend files: convert a model file or a node into a .blend that Godot imports directly. References to it keep working.

Requires Godot 4.4+ (developed on 4.7) and Blender 4.2+ (developed on 5.2).