Spherical shaped drinking glass designed for single shell corkscrew printing with T-glase filament. Fits well in the hand, nice interference finish, lightweight but perfectly water tight. The shell is only 0.5mm but still robust! Material cost is about 0.5€.There are two models, one non-closed surface and one solid object. The open surface works fine in Simplify3D, don't know about other slicing software. If you have problems, then use the solid object and cancel the print before it starting to fill the upper surface. Tested with Wanhao Duplicator 4x with 1.75mm T-glase filament. Used glass plate with painter´s tape. Sliced with Simplify3D (unit: mm): Layer height: 0.37mm Bottom layers: 3 Shells: 1 one corkscrew vase mode Temp: Extruder=235C, board=80C Speed: 650mm/min Extrusion multiplier: 1.15 Extrusion width: 0.5mm