Another useful one is to test for backlash on the delta printers, or tilt+backlash on most other types of printer with a moving X carriage. An outline is:
Move to X minimum Y centre Move X to centre Probe several times as per these M48 macros and report the resulting mean and SD Move to X max Move X back to centre Probe several times as per these M48 macros and report the resulting mean and SD Look for differences in the mean between the two sets of resultsOn deltas, also do the above using Y movements instead of X movements.