All STL files is checked for errors by Magics software. Model is ready for prototyping on CNC and 3D Printing.The .3DM file you can open in Rhino 2 and later. Use snap grid (1mm) for centering.#RINGS #EngagementRings #CoupleBands #Casualbands #Cocktail #BridalSet #TrendyRings #TwinRingsJewelry ring for woman print model