Litimos
thingiverse
These are basically blocks of wood that can be used as dominoes, but since they're needed for a school project, it's worth coming up with a more unique name while going above and beyond to get exactly what's required.
Download Model from thingiverse
With this file you will be able to print Litimos 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 Litimos.