Dual Lifting Arms GBC module from nxtstep101 is slightly inspired from Akiyuky’s Lifter Triggered by a Stuck Ball module. The simplicity of building of this marble run machine, its reliability as well as the fact it uses mainly common LEGO parts make it a truly excellent choice to start with LEGO GBC. This Great Ball Contraption consists in two arms that are alternatively lifting balls towards an upper exit ramp. Thanks to a smart mechanism, GBC balls are blocked until they are caught one by one by articulated arms. Reproduce this module thanks to Free Building Instructions available on Planet GBC.
Original design by: nxtstep101
Number of parts: 277
Original Blog Article (English): here
Complexity for building: 
Price for Building: €€, affordable
Dual Lifting Arms, on nxtstep101 YouTube channel
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I successfully built this, and it works very well.