Is the effect good? Not really! Can it be used somehow? It's not that great either!

This is a simple but barely functional marble-catching mechanism designed for a high school engineering class in just a few days. You can do whatever you want with it, and I don't care at all.

The assembly steps are as follows: First, combine the base and the slope, then slide the two sides of the upper structure into place. Place the swing arm between them, fix it with