Ghost Post
grabcad
The concept is still under development. The portable Ghost Post, when planted in the ground, employs laser beams for demarcating boundaries and marking field lines. This device uses a stud sensor that detects when the ball leaves the play area, changing its color accordingly. It only reacts to objects within 400-500 grams range, so random human intrusion won't trigger its change in colors.
Download Model from grabcad
With this file you will be able to print Ghost Post 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 Ghost Post.