Because of the very low slope, the ball rolls at a satisfyingly slow pace, making it a perfect desktop "fidget" or a calming visual experiment. At the end of the descent, the ball exits the track through a specialized exit tunnel built into the outer wall.
Important Post-Processing Tip
To keep the design compact, the exit tunnel has very tight tolerances. Depending on your printer's calibration, you will likely need to sand the inside of the tunnel with a small piece of sandpaper after printing. This ensures the 12.7mm ball passes through smoothly without getting stuck.