GBC HourGlass is an astonishing LEGO Great Ball Contraption from Tomas Ullrich. In this crazy-cool LEGO marble run machine, your GBC balls are going to do several 360° turns within some vertical tubes looking like hourglass. A vertical conveyor placed on top of the entry ramp in injecting the balls, one by one, into the main hourglass structure. The rotations of the transparent hourglass structure is then doing the rest: whenever it does a full turn, GBC balls are shifting by one position towards the exit ramp. After eight full rotations, your favorite LEGO basket and soccer balls are released. Rush to discover this brilliant mechanism on the YouTube channel from Tomas.
Original design by: Tomas Ullrich
Number of parts: 880
Original Blog Article (English): here
Complexity for building: 
Price for Building: €€€, average
GBC HourGlass, on Tomas Ullrich YouTube channel
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No Building Instructions are (for the moment) available on Planet GBC for this LEGO GBC module.
If you have reproduced this LEGO GBC module or simply want to share links where we can find instructions for it, please contact us via the link HERE. We’ll include your links/videos/comments (of course, with full credit to the originator). Planet GBC community will for sure be graceful to benefit from your inputs !
Planet GBC Building Instructions and Ready-to-Build LEGO sets are just waiting for you !
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This module was rebricked by me and I was able to bring in some improvements that were coordinated with Tomas Ullrich. The module can be viewed and experienced live at Bricking Bavaria 2022.