TAKE A PIECE OF CARBOARD AND CUT OUT HOW EVER SIZE YOU WANT YOUR cardboard breadboard to be and make two of the same size pieces of cardboard you cut out with a knife or hobby knife thats what i used.
OK you got your cut out pieces of cardboard so now you want to do what i did in the first image . draw lines as i did in image 1 draw the lines far apart so different rows don't come in contact once you power the rows and because so the led's don't have a hard time meeting in contact withe aluminum tape. ON THE OTHER PIECE OF CARDBOARD YOUR GOING TO DRAW THE LINES SO THEY ARE IN THE same place drawn as the one you just drew on so now you should have two cardboard pieces with lines on them Once you got this you are going to PUT THICK pieces of tape NOT TOUCHING other pieces OF TAPE ONTO THE CARDBOARD. you should end up with what is in image 5. now find a item every person should have is a pin or push pin. take the piece of cardboard that doesn't have the tape on and make holes don't continue to the other side because there's 2 sides so the middle shouldn't have any holes in the middle so one side is negative and one side is possitive .once you done all the holes on both sides all the way down. Put the piece of cardboard with the tape on it and put it under the on withe the holes in it. now you should have what i have a fully functional CARDBOARD BREADBOARD
WHERE TO GET ALUMINUM FOIL TAPE IS AT HOME DEPOT COST IS 12 DOLLARS NOT FOR ONE CARDBOARD BREAD BOARD BUT HUNDREDS.
THE REASON I MADE THIS IS BECAUSE SO YOU DON'T HAVE TO PAY $12.00 ON A BREADBOARD THE SIZE OF YOUR HAND