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.
Model is provided as a 1 Mil polygon, decimated STL and as a 3 Mil, quad topology OBJ.
Nominal size (although easily adjustable in any 3D software) is:
45 mm wide/ 45 mm tall / 5.9mm deep/ volume: 4.75 cm3