It's also super comforting to know that I'M NOT DOING ANYTHING WRONG and there's nothing wrong with my setup that'll bite me later. That was my main concern.

It's also super comforting to know that I'M NOT DOING ANYTHING WRONG and there's nothing wrong with my setup that'll bite me later. That was my main concern.

I don't want to spend more money on an ethernet bridge. Pi4s and touchscreens I have littered about the workshop practically for free 😂 All I need to do is put my heater autotune parameters and delta auto-configure results manually in config.g. I run auto-config before every print anyways. I can't think of anything else I use M500 for. It's only tedious initially because of the initial configuration which requires adjusting those settings multiple times until I zero in on the right ones.

@bearer The main thing it gives me right now is the ability to have the Pi 4 outside of the electronics enclosure, which gives me functional wifi without requiring any additional adapters (the base of my delta printer is all aluminum). I also have it hooked up to a Pi touchscreen, which gives me a much more complete interface at the printer itself, rather than the limited interface of a PanelDue. Plus I have a Bluetooth keyboard and touchpad paired, which has been convenient. And having the Pi 4 right there makes it super simple to have a camera hooked up for monitoring progress and/or capturing time lapses. Honestly, I'm loving the SBC thing compared to my other Duet-powered setups. If it's only the lack of M500, I'll deal with that until it's fixed. I just wish I hadn't wasted a week on trying to resolve this.

I haven't seen any mention of M500 or M501 in the recent 3.2 beta fixes and changes, so it doesn't look like it'll be making it into this release.

Also, that's a super bizarre omission that makes no sense at all. I hope it gets rectified soon. Having only M500 and M501 not work in SBC mode is seriously odd

@bearer Thank you!

That would've been nice to know right off the bat. Especially since none of the guides take it into account. Seems like I could've saved a whole lot of head-banging if that had been cleared up immediately.

Is there some other kind of official support medium than this forum? Because I spent a lot of money on these control boards and I really don't think I'm trying to do anything fancy or outside of reasonable use. It's literally been over a week now.

@Phaedrux Yes, I made sure all packages were up to date and I rebooted. Here's a log output when I try to run M500:

Oct 16 18:05:08 duet3 DuetControlServer[1464]: [error] Code M500 has thrown an exception
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    System.NullReferenceException: Object reference not set to an instance of an object.
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Files.ConfigOverride.WriteModelParameters(StreamWriter writer) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Files/ConfigOverride.cs:line 77
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Files.ConfigOverride.Save(Code code) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Files/ConfigOverride.cs:line 34
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Codes.MCodes.Process(Code code) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Codes/MCodes.cs:line 652
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.ProcessInternally() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 479
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.Process() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 400
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.ExecuteInternally() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 336
Oct 16 18:05:08 duet3 DuetControlServer[1464]: [error] IPC#46: Failed to execute SimpleCode
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    System.NullReferenceException: Object reference not set to an instance of an object.
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Files.ConfigOverride.WriteModelParameters(StreamWriter writer) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Files/ConfigOverride.cs:line 77
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Files.ConfigOverride.Save(Code code) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Files/ConfigOverride.cs:line 34
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Codes.MCodes.Process(Code code) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Codes/MCodes.cs:line 652
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.ProcessInternally() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 479
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.Process() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 400
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.ExecuteInternally() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 336
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.ExecuteInternally() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 383
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.Code.<Execute>b__27_0(Task`1 task) in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/Code.cs:line 277
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.Commands.SimpleCode.Execute() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/Commands/SimpleCode.cs:line 136
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetAPI.Commands.Command`1.Invoke() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetAPI/Commands/BaseCommand.cs:line 67
Oct 16 18:05:08 duet3 DuetControlServer[1464]:    at DuetControlServer.IPC.Processors.Command.Process() in /home/christian/Duet3D/DuetSoftwareFramework/src/DuetControlServer/IPC/Processors/Command.cs:line 63

I tried re-imaging the micro SD card with a downloaded image of the OS (rather than the one that came pre-loaded on the card). The OS from the downloaded image looks very different. It uses a different desktop environment, and it presents me with a setup wizard on first boot for configuring location, networking, password and initial updates. The pre-loaded image never did that.

However I still can't run M500 without getting the error message listed above. I'm not sure what I'm doing wrong.

No help with this? It's still plaguing me.

That's super helpful. For clarification, I'm pretty sure that, if connecting 2 in series, the resistance of the thermistors needs to be combined in config.g. So if each thermistor is 100k at room temperature, they need to be set as 200k when declaring the sensor with M308. And if connecting in parallel, the resistances need to be half their combined average (or just half of one if both are the same). Someone correct me if I'm wrong.