FDM STEPS/MM CALIBRATION

Right off the bat, I didn't create this, my brother did, he gets the credit.

So, print this little fella, take all the measurements with whatever measuring apparatus you have; Vernier calipers, dial calipers, digital calipers, a set of micrometers, or a Coordinate Measuring Machine.
Drop your measurements in to the attached spread sheet, populate the [Additional Info] section with your current machine configuration, and it'll run the information through a linear regression, and determine your optimum steps per mm.
Update your machine to that, and you should be good to go.