bulldw2021

Using: Blender 2.8 and latest version of Ultimaker Cura with blender plugin. I designed a simple 3D pulley wheel in Blender. Checked the setting where in metric and units are in millimeters. Saved the file with a .blender extention as my Ultimaker Cura has a blender plugin. However, importing the .blender or .stl file into cura produces the same 2d circle. Can some one advise me what I am doing wrong? cylinder1.stl