Edit 04/29/19: Added a 25 slot version per request.
Was tired of having all my filament sample cards connected to a zip tie. This way I can pull one out at a time very easy and not have to worry about dropping them all while doing so. Prints all one piece, but does take awhile.Took me about 10 hours. Pretty sure the gcode thins all the thin divider walls count as perimiters, so that might be the reason. Came out great though! Allows me to seperate by color and filament type and gives me an excuse to buy more rolls to sample!
Here is a link to my current design of sample cards I am using: https://www.thingiverse.com/thing:3268077
It is pretty long, almost 182mm. So hope you have good bed adhesion!