“Escalier 6 marches” is another very cool LEGO Great Ball Contraption from the French GBC builder Phi.L. This pocket LEGO ball machine is composed of 6 steps (hence the name of the module), each one of them having a rotating arm plugged to it. The rotations of the arms and their perfect misalignment are pushing the GBC balls from the entry bin to the top of the GBC module. You can now reproduce this fun LEGO GBC, a bit challenging to configure right perfectly though, thanks to free building instructions made by Phi.L and available on Planet GBC.
Original design by: Phi.L
Number of parts: 306
Complexity for building: 
Price for Building: €€, affordable
Escalier Six Marches, on Phi.L YouTube channel
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