Optimal Calibration cube size?

[KatMan 0]

So I just spent a bunch of time installing a new heated bed, getting bed perfectly leveled, Z offset and extruder calibration etc. on my early Ender 3. Thankfully it still prints great. Now I'd like to calibrate X and Z steps to the nth degree as well. In an effort to use every last millimeter of a spool I'm presently printing a 10x10x10 cube I created in TinkerCad and am slowly creeping up on it. Z axis is perfect at 10.00mm. X and Y were off by .10 or so each. 

 

Most of my printing is from 6mm to maybe 60mm at the biggest. Should I create and use the small cube, a 60mm cube or somewhere in the middle and accept compromise?

 

Thanks for any suggestions!

[KatMan 0]

Hmm. Surprised at no suggestions.