Cad Training
grabcad
Ok heres a little drawing that you could make it would be interesting to see it made in different cad formats.
Download Model from grabcad
With this file you will be able to print Cad Training with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Cad Training.