This is a simple calibration block that will test your step accuracy in all three directions.
The longest arms are 100mm long in the x, y, and z directions, and they are 10mm thick.
the next step down is 50mm in the x, y and z directions, and 20mm thick.
You can use these measurements to check your steps and troubleshoot dimensional accuracy problems.
the top of the z tower is a little bit of a torture tower, i do recommend setting a minimum time for layer and lifting the head to force it to wait so that your tower doesn't come out all wonky.
minimum layer time: 10 to 15 seconds w/ head lift
203C with AIO PLA
50C glass bed
50mm/s print speed
2 perimeter walls
infill 10-15%, just enough to keep the walls and tops accurate for measurement.
If you don't use retraction then you'll get the little stringy bits (like i did in the pics) off the tower when the head lifts off the part while it's waiting for the minimum layer time.