Export your design out as a .stl file for 3D printing.
Go to MAKE in the top menu bar and select 3D Print.
The Output settings in 3D Print dialogue box will always default to Send to 3D Print Utility, which is a commercial online 3D printing service. Since we have access to 3D printers, make sure to untick that box. This will allow you to save as a .stl file instead.
Check that your Mesh Refinement is set to Low and that Preview Mesh is Selected then click on your 3D model and press OK.
Make sure to save your file as a .stl with a memorable name on the desktop.