Global metric settings
thingiverse
Now you can just set the outside dimensions in millimetres. Also included dimensions for standard USA 12x10 vent printed on the cr10.
Download Model from thingiverse
With this file you will be able to print Global metric settings 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 Global metric settings.