Brick
thingiverse
You're going to utilize it for creating a mold that will hold the shape of freshly poured concrete, allowing it to set and harden into a solid form.
Download Model from thingiverse
With this file you will be able to print Brick 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 Brick.