G92 strange behaviour

lukas

Hello to the forum, I have built and set up my new delta printer and now I'm trying my first prints. On my previous cartesian type I found some toolchain out of the box and never actually cared about absolute/relative extruder moves and that this where I ran into difficulties now - I'm not able to set E0 coordinate to zero after some extrusion.

At the beginning M114 reports :

[[language]]
X: 10.000 Y: 10.000 Z: 100.000 E0: 30.0 E1: 0.0 E2: 0.0 E3: 0.0 E4: 0.0 E5: 0.0 E6: 0.0 Count 25742 26614 26924

After running G92 E0 I would expect M114 to report E0:c0.0 however it still reports E0:v30.0

Ok, so I tried G92 alone without parameters and surprisingly the output is still :

[[language]]
X: 10.000 Y: 10.000 Z: 100.000 E0: 30.0 E1: 0.0 E2: 0.0 E3: 0.0 E4: 0.0 E5: 0.0 E6: 0.0 Count 25742 26614 26924

Ok for the 2nd time, let's send G92 Z0 to set Z coordinate to 0. Now the M114 reports that the Z coordinate has been set to zero and also the E0 is set to zero :

[[language]]
X: 10.000 Y: 10.000 [b]Z: 0.000 E0: 0.0[/b] E1: 0.0 E2: 0.0 E3: 0.0 E4: 0.0 E5: 0.0 E6: 0.0 Count 17742 18614 18924

Am I missing some logic? Am I doing something wrong?

–-------------------------
I'm running RepRapFirmware 1.18.1 on Duet WiFi 1.0 with single extruder/hotend

dc42

The zeroing of coordinates is working, it's the reporting of extruder position in M114 that is wrong. The code updates the reported coordinates after every move, and after a G92 command that sets one or more axis positions. Currently it doesn't update the reported position after a G92 that only affects extruders. I'll fix this in the next release.

lukas

Thanks for clarification David, I started to think I was mad!