Mechanical catalysis on the centimetre scale

Shuhei Miyashita, Christof Audretsch, Zoltán Nagy, Rudolf M. Füchslin, Rolf Pfeifer
Journal of the Royal Society Interface (2015) 12: 20141271.
DOI: 10.1098/rsif.2014.1271

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You can download the .STL files of the units from:
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The magnets used in the experiments are: S-03-03-N, 3x3mm:

The iron plate placed below a substrate unit can be anything similar, as long as it weakly attracts the substrate (SL+SS) and prevents it from floating away from the position.