Marlin Bed Leveling Mesh Test

This object is a test pattern that can be used to verify your bed-leveling mesh settings. It was created as a basic version of the [G26 code](http://marlinfw.org/docs/gcode/G026.html) when using 3-point, linear or bilinear mesh leveling setups.

The image is exactly 1 layer height high. You should scale the X and Y axis as needed to fill up as much of your bed as possible. The pattern should print consistently and evenly on the bed.