Awhile back I made an indesign template for designing one-inch buttons. I’m not sure why I never posted it before now. (I’d guess “sloth” as the most likely answer.)
I’ve uploaded the .indd file for InDesign CS6 and the .idml file for InDesign CS4 and later. 35 buttons fit on each page. The outer black circle is the only printing guide, and it shows you where to cut. The green margin is the safe bleed margin. The pink margin indicates the actual edge of the front of the button, while the blue box within that is the safe margin for text and important elements on the button. When you print, make sure you set it to print at 100% size, rather than “shrink to fit.”
This template is designed for the “American Button Machines” style one-inch button machine and I’ve got no idea if it works for any other type of button machine, but to be honest I’ve never met anyone with a different brand of button machine.