What "G92 A0 B0" means?

[Kaimai 0]

I'm sorry if there've been any other related posts before, but I couldn't find anything.

With a X-Maker by Qidi-tech, it uses Cura_SteamEngine 4.3.0, I had a gcode which has a "G92 A0 B0" line in the startup section. What does "A0 B0" mean?

I looked at Marlin's G92 instruction, but there's no information about "A B". What are these codes?

https://marlinfw.org/docs/gcode/G092.html?fbclid=IwAR0oJfFkVRu9ZOrBnKiuZ_pAb3qw6sU-JlfleFfyMBgQTNOJematNT2BU_Q
X-Maker has only one extruder, "G92 E0" probably sets the current filament position to zero, but can't determine what "A0 B0" means.

 Thanks in advance!

The text below is the start up codes generated. It has "G92 A0 B0" three times.
-------
;Generated with Cura_SteamEngine 4.3.0
M82 ;absolute extrusion mode
G92 A0 B0
G28 X0 Y0
G0 X-1000 Y-1000 F1800
G28 Z0
G1 X0 Y0 Z50 F3600
G1 X0 Y0 F3600
M140 S60
M104 S230 T0
M190 S60
M109 S230 T0
G92 E0
G92 A0 B0
G0 X0 Y4 Z0.3 F3600
G1 X170 Y5 F2400
G1 X5 A13 F2400
G92 A0 B0
G1 X5 F2400
 

[nallath 1,120]

By the looks of it this was manually added to the start gcode.

I've only found references to A & B in g-code in context of replicatorG: http://replicat.org/gcodes

[Kaimai 0]

Thank you!  I got it!

[gr5 2,167]

Is it possible that A,B,C can also refer to the 3 servos on a delta printer?  I've seen internal firmware (redeem) refer to the servos this way but I've never seen gcodes that refer to them that way so I'm thinking that nallath's explanation is the correct one.

[Kaimai 0]

19 hours ago, gr5 said:

Is it possible that A,B,C can also refer to the 3 servos on a delta printer?  I've seen internal firmware (redeem) refer to the servos this way but I've never seen gcodes that refer to them that way so I'm thinking that nallath's explanation is the correct one.

Sorry, I don't have any delta printer.  

I tested generating gcodes of the same STL model with two methods,

(1) By Cura 4.8.0 on Windows10 with Marlin flavored setting.
(2) By Qidi-Print on Windows10 (uses Cura_StreamEngine 4.3.0 internally)

 

and had "G92 A0 B0" lines only when case(2). So it seems like originating in Qidi-Print's specific implementation. Anyway, it won't affect actual printing, no problem.
 

[nallath 1,120]

On 2/19/2021 at 1:50 PM, Kaimai said:

and had "G92 A0 B0" lines only when case(2). So it seems like originating in Qidi-Print's specific implementation. Anyway, it won't affect actual printing, no problem.

 

Even though Qidi uses Cura, they haven't released the source code (and are thus violating the licence Cura was released on). I have asked them to adhere to the licence, but i've not been able to get any response from them. As such, I can't say what changes they actually made.