This is a more elaborate version of thing https://www.thingiverse.com/thing:3382580, using the same technology as the other Zuse inspired parts.
A 3 to 8 decoder could be created with a collection of AND amd/or OR gates, but this would require several stages and clock-cycles. This design reduces it to one but for the price of having to move a chain of plates which due to tolerances becomes less reliable. The layout is unlikely to van been used in the real Z1 calculator, but it nicely shows how a decoder can operate.
In the realized decoder, each function has its own color; gray for the fixed structure, yellow for the inputs, black for the clock plate, green for the intermediate plates, blue for the output plates and red for the switching pins. The clips on the pins have the function of keeping the plates in place during movement.
Brand: Any will do PLA, but any rigid filiament will do
as you like it
Assembly of the 3-to-8 decoder
The clips on the pins should not be tightened, as this interferes with proper operation.
The SCAD designs for the plates are in the basics.scad file, as I needed those for the proper dimensions of the base plate. STLs can be generated by uncomment the proper function at the end of the file.