Two pieces with guides are problematic for any marble that doesn't fit exactly to size. This can be fun for the building process, just put a whirlpool on the ground to catch the smaller balls as they fall and it works as an unintended divider. These two pieces would be better than regular gutters rather than rails to allow all the balls to flow. That being said, the switch parts are some of the best parts I have. This makes things more interesting or just helps ensure you don't send a flood of marbles into the same lane. I wish there was a way to get more switches without having to buy parts with rails.
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