Z Axis Homing Fails on E3D ToolChanger

rking

Has anyone gotten z axis homing to work on E3D ToolChanger with Duet 2, rrf3. I’ve tried everything I can think of, the wiring is correct, the Duet board Z led goes out when the Z switch is pressed. Z moves work fine. X & Y homed first, then G30 just crashes into the z switch and screams and I have to emergency stop. I have found out that rrf3 made major changes in how z homing and probing works, but am unable to find any corresponding updated g-code, just some cryptic words about separating homing and probing. E3D support has bee useless. Any help appreciated.

engikeneer

@rking post your config.g and homing files so we can see what you've currently got. Best if you use the </> code snippet tool when posting them on the forum as its easier to read.
Which exact RRF version are you running? M115 will report it

dc42

@rking the files I was using on my TC with RRF3 on Duet 2 (before I converted it to Duet 3) are at https://github.com/Duet3D/RRF-machine-config-files/tree/master/E3D_Tool_Changer/dc42-wifi-centreZero-quadTitan. I suggest you check the M574 and M558 commands in config.g in particular.

rking

@dc42

Thanks for your response & link.

I uploaded the files in sys and macros from your linked dc42-wifi-centre Zero-quadTitan zip to my Duet2 quad Hemera SD card. Made no changes. Still stuck, but nat as bad.

It seems in my previous testing I managed to break the Z stop micro switch, leaving it in the open circuit “triggered” state, so I can’t continue until I get it replaced. Is there a way to test Z homing without destroying the switch?

However, the zhome.g code does nothing. It doesn’t get past the M98 Open Coupler command. This is after first homing X & Y. Why open the Coupler? Wouldn’t that drop any un-docked attached tool?

In any case when I comment out M98 in zhome.g I see the bed move as commanded, but that’s all. G90 does nothing. I assume this is due to the open (already triggered) Z switch.

Can you recommend a US supplier of the ToolChanger Z Endstop switch, or at least tell me brand and model? Or maybe just send me one.

Is there any way to test Z homing without destroying the switch?

Thanks

rking

@engikeneer

Thanks for responding. I have downloaded new firmware linked by dc42 (see my response to him). Broke my zstop switch. May get back to you if I remain stuck.