One of my super marble runs with multiple rides, a looping, a 50 feet lego track and lots more. http://www.knikkerbaan.nl
Specs:
Construction date: 7 jan 2000
Construction time: 13 days (incl testing)
Total track length: around 40 meters (130 feet)
Lego rail length: 17 meters (50 feet)
Lego rail ride time: 40 to 60 seconds
Start unit: Lego container with mill dosing system who drops some marbles every 20 seconds.
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