A dangerous pigeon for your keychain. Its dimensions are : X: 20.9 mm. Y: 10.3 mm. Z: 32.7 mm. It is ready to print. I am sure of that and check it in blender. It has : Non-Manifold :0 Intersections :0 zero faces and edges: 0 non_flat faces :0 Thin faces :0 Sharp edges: 0 I tested in Cura, too, and everything is good. I hope when you print It not have any problem. It would be more beautiful with colors.