I'm trying to test the accuracy between two of my z-probes for choosing the better one, and I'm trying the script from here: https://forum.duet3d.com/topic/1291/testing-resolution-accuracy-your-results-wanted-z-probe-results

Since the thread is locked and I don't want to dig up that thread, I'm making a new one for an issue I'm having.

When running the 36 probes 1 point script, in which I have just modified the X and Y position (see at the end), I get the following output when the script is finished:

```
11/29/2019, 1:36:15 PM M98 P"0:/macros/Testing/Z-Probe Accuracy"
Error: G30: Z probe point index out of range
Error: G30: Z probe point index out of range
Error: G30: Z probe point index out of range
Error: G30: Z probe point index out of range
```

Any idea what's going on? I searched for the error message here and via google, but I found nothing. Is there another way to test z-probe accuracy?

Info: RepRapFirmware for Duet 2 WiFi/Ethernet version 2.03 running on Duet WiFi 1.02 or later

Thanks!

Code for the script:

```
;prob testing single point.
G30 P0 X178.5 Y145.5 Z-99999 F2000
G30 P1 X178.5 Y145.5 Z-99999 F2000
G30 P2 X178.5 Y145.5 Z-99999 F2000
G30 P3 X178.5 Y145.5 Z-99999 F2000
G30 P4 X178.5 Y145.5 Z-99999 F2000
G30 P5 X178.5 Y145.5 Z-99999 F2000
G30 P6 X178.5 Y145.5 Z-99999 F2000
G30 P7 X178.5 Y145.5 Z-99999 F2000
G30 P8 X178.5 Y145.5 Z-99999 F2000
G30 P9 X178.5 Y145.5 Z-99999 F2000
G30 P10 X178.5 Y145.5 Z-99999 F2000
G30 P11 X178.5 Y145.5 Z-99999 F2000
G30 P12 X178.5 Y145.5 Z-99999 F2000
G30 P13 X178.5 Y145.5 Z-99999 F2000
G30 P14 X178.5 Y145.5 Z-99999 F2000
G30 P15 X178.5 Y145.5 Z-99999 F2000
G30 P16 X178.5 Y145.5 Z-99999 F2000
G30 P17 X178.5 Y145.5 Z-99999 F2000
G30 P18 X178.5 Y145.5 Z-99999 F2000
G30 P19 X178.5 Y145.5 Z-99999 F2000
G30 P20 X178.5 Y145.5 Z-99999 F2000
G30 P21 X178.5 Y145.5 Z-99999 F2000
G30 P22 X178.5 Y145.5 Z-99999 F2000
G30 P23 X178.5 Y145.5 Z-99999 F2000
G30 P24 X178.5 Y145.5 Z-99999 F2000
G30 P25 X178.5 Y145.5 Z-99999 F2000
G30 P26 X178.5 Y145.5 Z-99999 F2000
G30 P27 X178.5 Y145.5 Z-99999 F2000
G30 P28 X178.5 Y145.5 Z-99999 F2000
G30 P29 X178.5 Y145.5 Z-99999 F2000
G30 P30 X178.5 Y145.5 Z-99999 F2000
G30 P31 X178.5 Y145.5 Z-99999 F2000
G30 P32 X178.5 Y145.5 Z-99999 F2000
G30 P33 X178.5 Y145.5 Z-99999 F2000
G30 P34 X178.5 Y145.5 Z-99999 F2000
G30 P35 X178.5 Y145.5 Z-99999 F2000 S-1
```

]]>I found another script on the linked github repo: https://github.com/T3P3/GcodeMacros/blob/master/Calibration and Tuning/Diagnostics/Probe_Repeatability_test

Works fine now, got a mean deviation of around 0.00759 mm, seems good to me!

]]>BTW it's useful to run tests separately with the probe points approached from the +X, -X, +Y and -Y directions, to check for certain types of backlash in the positioning system.

]]>