dicemaster playmat
thingiverse
Dicemaster Playmat, Quite big, scale as needed. Might do a modification to make it foldable, but that would be a future project.
Download Model from thingiverse
With this file you will be able to print dicemaster playmat 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 dicemaster playmat.