I made a tablet stand that can produce three angles. It was beautifully printed and worked well. However, the tablet may slip from the back.slip is not happening at the moment. but to make it more stable. I wanted some solution. so,A cube block was added in the back side to prevent slipping. and wanted to print it. but when I import 'stl' file to the slicer, error occured. so, I brang previou..