This is just a simple bed leveling test. It was sized for a 220mmx220mm bed. Although you can resize in your slicer to fit your bed. All of the squares that you would normally see on a test like this have been replaced with circles. There are absolutely no sharp corners. The idea is to allow your printer to smoothly go around without any cutovers. If you were to let this print complete, it will be 2mm in height.