This is a simple object for interrogating the dimensional accuracy of your printer. I accept 1 layer height of variation as being within the acceptable range (e.g. ± 0.20 mm).

It takes about 12 minutes to print at 70 mm/s, 0.40 mm nozzle, 0.2 mm layer height.

Dimensional accuracy is less important than getting enough plastic down. Calibrate your flow rate correctly to figure this out.