Clip together tiles of logic gates you can use to play with logic circuits; can be used to teach logic concepts.

Toys to teach logic circuit concepts, a little more tactile than drawing diagrams. You could also modify them to add magnets so you can put them on a white board. Perhaps can be used to make puzzle for kids w/the bonus of getting a little exposure to ECE(Electrical/Computer Engineering.)
 

Logic Gate Reference:

Printing Estimates/Stats:

Ave Tile(2 Color) = 15% Infill - 5.31g - $0.10 cost(PLA) - 12m32s printing time

Ave Tile(1 Color) = 15% Infill - 3.69g - $0.07 cost(PLA) - 8m10s printing time

“True State - Input+Output” and “False State  - Input+Output” to give internal state outputs.