[RCBrust]

I have a question about bending paper/card stock into cylinders, and dimensions. Say I want a 1/2" diameter cylinder, so I cut a piece of stock to length 0.5 * Pi and roll it into a cylinder with a butt joint. What ends up having a dimension of 1/2"? The cylinders ID, OD, or the center of one side to the center of the other side?

To get an accurate ID, do you typically have to add a paper thickness to the desired ID before multiplying by Pi?

Thanks,
Randy