2_
thingiverse
A customized adaptation of http://www.thingiverse.com/thing:29211 has been created using the Customizer at http://www.thingiverse.com/apps/customizer/run?thing_id=29211. For instructions, set gridY to 67, gridX to 40, thickness to 2.5, meshSpace to 2.5, meshSolid to 1, and add borders of 3 units in both the Y and X axes.
Download Model from thingiverse
With this file you will be able to print 2_ 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 2_.