A rodlogic gate as featured in
Drexler, K.E. Nanosystems: Molecular Machinery, Manufacturing, and Computation.
New York: John Wiley & Sons (1992). (Chapter 12)
Mainly usable for demonstration purposes of logic gates.
The nobs on the lower side should be compatible with lego-technic.
The basis cubic grid size is 3mm.
It's untested, so ordering is blocked for now.