Quick and simple cufflink with the nightwing logo I made for my buddy. He's planning on painting the front with enamel paint from his models set. I'm not sure I've got the post dimension quite right, but I'll update after printing.
I use Fusion in inches mode, so you'll have to scale it by 2540% to get it to the right dimensions in mm
Updated the file. The original stem was too long and narrow. New print is a lot better.