Okay coming on back for anyone reading this with possibly the same issue. The suggestion of twisting the wire pairs looks like it has fixed the issue so far. I have a 6-wire stepper cable that adapts on down to four to the Duet. I took an extension out since I really didn't need it, then popped the wires out of the molex connector two at a time. I then twisted those, putting them back into the ends when done. I ended up with 3 twisted pairs.

Hooked everything back up, have run 3-straight days of prints and am back to boring flat temp lines and the MFM hasn't errored once. A HUGE thank you to the people who gave suggestions, they were right on. Thank you all!!

Okay coming on back for anyone reading this with possibly the same issue. The suggestion of twisting the wire pairs looks like it has fixed the issue so far. I have a 6-wire stepper cable that adapts on down to four to the Duet. I took an extension out since I really didn't need it, then popped the wires out of the molex connector two at a time. I then twisted those, putting them back into the ends when done. I ended up with 3 twisted pairs.

Hooked everything back up, have run 3-straight days of prints and am back to boring flat temp lines and the MFM hasn't errored once. A HUGE thank you to the people who gave suggestions, they were right on. Thank you all!!

Man, thank you everyone so much. I appreciate your responses and the time you took to do so. I am going to first try the braid/twisting, then will go to shielded if I have no luck there. Thank you again!

@Phaedrux forgive my ignorance, but you are literally just doing a braid of the existing wires like you would long hair?

Hey there, first thanks for reading. I appreciate your time.

I have an Ender 5+ running a Duet Maestro with a hemera direct drive setup inline with a Duet MFM. The hemera is a running a volcano hot end setup. Everything was working well, but I have had weird issues that I believe is being causing by the stepper motor wire being in close proximity with the thermistor wire and the Duet MFM wire.

The problems I have seen: Initially I was seeing weird issues with the MFM. It would be working well, then all of sudden throw weird low to no movement errors followed by high movement errors. On checking the filament all was well, and I was starting to think that the MFM was bad or malfunctioning since I have not gone to 3.0 yet on the board. I read in the forums that perhaps proximity to the stepper motor wire was causing interference. This seemed to be the issue as I had all wires in a bundle wrapped in a prusa cable wrap and zip tied for good measure. I removed the duet wire from the bundle and had it run outside this bundle for some short prints. Voila, this fixed the issue! No more false readings. So I set out to separate the MFM wire from the stepper motor by putting the other wires between it. (I know, I can see my folly).

That was when the thermistor errors started. Up until this point, my temps had been rock solid. I mean, boring. After PID tuning, things were just working well. I made the change with the bundle of wires, and now my thermistor was doing weird things. Running at the right temp, then dropping 15 degrees in a second then back up until eventually it would drop enough for a heater fault.

On examining my hotend, it had come loose, which I figured was the problem. I reseated my nozzle, heat tightened it, made sure the wiring was good and then did another print. No problems at all! Problem solved! Yeaaaaah not so much. One print later, same issues.

So I got a new thermistor, rewired the entire Duet to be the right ends, no jumpers etc. Got everything stock and kosher. Reseated all the wires in the bundle, making sure to keep the MFM away from the stepper motor wire. Made sure the nozzle was seated well, started a print.

Heater fault. Same issue, sharp drops then return right back to the right temp.

Scratching my head, I started searching the forums and found out that the stepper motor wire can also interfere with the thermistor. I slapped my forehead.

Question; How do I shield the stepper motor wire from everything else effectively? This is the stock Ender wire that came with the unit with an extension I got from filastruder so I could go direct drive. I need to separate them out I think so I can avoid the cable noise and from getting false readings. What is the best way to prevent this?

Again, thanks in advance for your advice and time.

At what point are you going to say this is a bad unit and give the man a new one? Is there a rash of mfm's going bad due to firmware? I have one. Works fine. From a support perspective, this looks to be bad hardware. My two cents. It works, then it doesn't. Then it does for a bit, then stops. No change to anything on the system. Now he's at a halt. In addition, shinook is an absolute duet fanboi. He got ME into the mfm even though I didn't want to. So glad he did because I love it. Let's move this guy forward.

@dc42 said in I think my new Magnetic Filament Monitor is dead.:

Thans, looks like you are getting quite a lot framing errors (but interestingly, no parity errors). So I think it's likely that the errors are caused by reception of bad data that isn't detected as such. I was already planning to change the firmware to ignore isolated data points that are out of line with other data. I'll bring this work forward, I may vebe start on it tomorrow.

Please post your config.g file, it may help me to reproduce the problem.

Does the filament monitor cable run close to the extruder motor cable (or any other stepper motor cable) for an appreciable distance?

@Danal thank you for replying! I use the bltouch that came stock with the printer.

So I think I'm over the major hurdles with the Duet 2 Maestro on my Ender 5 Plus (thanks in large part to this community, I cannot thank you all enough). One of the last things I had to tackle was a good first layer. I was struggling with the fact that my nozzle was too close to the print bed. Using some advice and reading I learned how to use the baby steps feature to work to dial it in.

My question; Once we have that dialed in the way it should be, how do we take that offset number from the baby steps and make it permanent in gcode? I am new to reprap as I was on Marlin with my older makerfarm prusa i3 clone.

Thanks again in advance for any help you can offer!

@veti, success! I am moving just fine with the new numbers. I am having a heck of a time with baby stepping, as my first layer is not printing I think due to the fact that the nozzle is too close. I will update when I figure that out

I apologize for the delay, @Veti I am testing those settings out now. Thank you so much for taking the time! @Jacotheron I also appreciate your input, I am testing your suggestion now. @dc42 I did retest and it did not work, however I have new numbers here that I am working with. I will update on my success. Thank you for your time!

@droftarts said in Duet 2 Maestro Ender 5 Plus print speeds won't go above 12mm:

@Walternate you will also need to change the M92 line after, dividing X, Y and Z values by 4, and E by 2. However x64 microstepping won’t stress the Duet. Just change the I0 to I1 in the M350 command.

Ian

So I made those changes and the z motor stopped responding all together. I reverted in code and we're back to moving well. I'm not sure what the change may have done. I appreciate your time, I'm going to investigate that more.