Mark IV challenge
grabcad
maybe.....https://www.facebook.com/3D-Technology-2124637971198511/?modal=admin_todo_tour
Download Model from grabcad
With this file you will be able to print Mark IV challenge 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 Mark IV challenge.