Vibration a.k.a. ripple a.k.a. shadow a.k.a. ghosting test

1. Print
2. Inspect for ghosting of the sharp edges (letters, dimples, corners)
3. Proof your machine for vibration
4. ???
5. Profit!

Note: I've noticed a lot of people complaining it's rotated wrong by default. It's actually not rotated wrong, it's just not rotated very intuitively :)

The letter X is not supposed to be parallel with the X axis - it's supposed to indicate vibration of the X axis. Since vibration of the X axis is perpendicular to the Y axis, the face that says "X" needs to be parallel with the Y axis.