8-Ball marker for APA / pool games. Credit card sized to fit in your wallet

Saw a hotel room key being used as a marker for APA and thought that that was a great size. Fits in your wallet or pocket very nicely. It's also not in the way when you line up for your shot. I've printed one for everyone on my team.  There's two models: one is a .8mm and one is at .6mm thickness. I like the .8 one for it's stiffness, but you might want a thiner one. Printed on a Prusa Mk4 (soon to be Mk4S!). .20 speed IS profile worked great.