3dmuza

I've made this cookie cutters with rhinoceros 6 and checked the stl file with Meshmixer and they seem fine. However, when slicing it on Cura 4.8 it creates inner squares as a wall which are not inteded to be there at all. Does anyone know if it is a problem of the modelling, the mesh or the way I'm setting Cura? Does it happen oftenly when modelling with Rhinoceros for 3D printing? To the post i attach the stl file and the pictures of what I 'm reffering to Thank you very much for your help cortante flor capsula 1.stl