Model created in Zbrush. It is watertight and ready for printing/milling. Although there are some slight undercuts, it was created with molding and casting in mind.
Inlcudes 2 versions - with and without the halo, each one has 3 file variants:
Nominal size (although easily adjustable in any 3D software) is: Version with the halo: -23.7mm wide -32.6 mm tall -3.6 mm deep