Tx command from Octoprint not recognized in Klipper

General Discussion
1

I have updated my good old Mendel90 to dual extruders and Klipper Firmware (RUMBA Board) and it runs fine. Octopi is the latest release (2 weeks back). I have defined the 2nd extruder in Klipper and in Octoprint and the temp page shows both. But the next page, where I would extrude/retract only shows one extruder and tool change doesn’t work ("Unknown command:“T1"”).

Terminal:
Send: T1
Recv: // Unknown command:“T1”
Recv: ok
[…]
Send: T0
Recv: // Unknown command:“T0”
Recv: ok

Klipper doc says it knows the Tx command, then why doesn’t this work? Is there a place to define T0/T1 in printer.cfg or does Klipper know that extruder=T0 and extruder1=T1?

2

Not sure where that link is from, but that’s not the current official documentation. See here: G-Codes - Klipper documentation

The ‘T’ command isn’t a built-in gcode in Klipper, but you can create macros for it to suit your needs.

3

It’s solved, I was missing the GCode Macros to switch extruders in printer.cfg.