3500 hours on my printer now skipping steps like crazy

[oliverracing]

I'd vote mechanical too but Im pretty sure i have managed to partially demagnetise a micro stepper before. I did this by running 1200ma through one designed for 250ma, but it got so hot to do this the mounts had also melted (cf-nylon). Not sure how you'd do this on a duet with anything other than a microstepper though.

I'm guessing 120degrees is F not C but have they possibly overheated anytime in the past?

[Phaedrux]

@oliverracing said in 3500 hours on my printer now skipping steps like crazy:

Not sure how you'd do this on a duet with anything other than a microstepper though.

Someone recently used a Duet 3 to put 3A through a 1.2A stepper for a long enough time to cook it. A bit harder with the Duet 2.

[jens55]

I believe stepper motors are usually rated for around 80C and start loosing magnetic properties (ie reduced output power) when you go much beyond that.

[gforce]

Wow thanks again guys. Lots of good help here.

I will update the firmware to 2.05.1 as suggested by engikeneer. But I might not be able to for a day or two. I will follow the guides carefully.

I would like to put a camera on it and recreate the issue to show you guys whats going on. Will work on that before the firmware change.

Yes, motors at 120f. I can't say that I have ever noticed the motors getting hotter. I have been warned (as I said before) of high driver temps, but not during this loss of step issue.
Motors on xy and z are 17hs24-2104s and they call for 2.1a current.

Just to shine more light on the mechanics. When the print is running I can push on the effector with at least several pounds and it doesn't miss a beat. So I'm not running on any ragged edges. I do notice some belt stretch on my top belt so I will change them both out in the next week or so but I'm quite convinced that is not causing the skipped steps.

Here is the config file. It has not changed for quite some time.

; Configuration file for Duet WiFi (firmware version 1.17 to 1.19)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool on Sun Nov 12 2017 16:20:08 GMT-0700 (Mountain Standard Time)

; General preferences

;Set Password
M551 PALLCAPSNOSPACES

M111 S0 ; Debugging off
G21 ; Work in millimetres
G90 ; Send absolute coordinates...
M83 ; ...but relative extruder moves
M555 P2 ; Set firmware compatibility to look like Marlin

M667 S1 ; Select CoreXY mode
M208 X0 Y0 Z0 S1 ; Set axis minima
M208 X416 Y420 Z360 S0 ; Set axis maxima

; Endstops
M574 X1 Y1 Z2 S1 ; Define active high microswitches
M558 P4 X0 Y0 Z0 H1 F200 T9000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P600 X0 Y0 Z2.5 ; Set Z probe trigger value, offset and trigger height
M557 X15:385 Y15:385 S20 ; Define mesh grid

; Drives
M569 P0 S1 ; Drive 0 goes forwards
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes backwards
M569 P3 S0 ; Drive 3 goes forwards
M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
M92 X80.16032 Y80.24072 Z2400 E408.173; Set steps per mm
M566 X900 Y900 Z8 E120 ; Set maximum instantaneous speed changes (mm/min)
M203 X25000 Y25000 Z200 E1200 ; Set maximum speeds (mm/min)
M201 X1500 Y1500 Z60 E250 ; Set accelerations (mm/s^2)
M906 X1900 Y1900 Z1500 E1200 I30 ; Set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout

; Heaters
M143 S290 ; Set maximum heater temperature to 290C
M301 H0 S1.00 P10 I0.1 D200 T0.4 W180 B30 ; Use PID on bed heater (may require further tuning)
M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1

; Tools
M563 P1 D0 H1 ; Define tool 0
G10 P1 X0 Y0 Z0 ; Set tool 0 axis offsets
G10 P1 R0 S0 ; Set initial tool 0 active and standby temperatures to 0C
M591 D0 P1 C3 S1; Turn on filament monitoring

; Network
M550 PDuet Wifi ; Set machine name
M552 S1 ; Enable network
M587 S"Airius Fans" P"another change of fans" ; Configure access point. You can delete this line once connected
M586 P0 S1 ; Enable HTTP
M586 P1 S0 ; Disable FTP
M586 P2 S0 ; Disable Telnet

; Fans
M106 P0 S0.3 I0 F500 H-1 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off
M106 P1 S1 I0 F500 H1 T45 ; Set fan 1 value, PWM signal inversion and frequency. Thermostatic control is turned on
M106 P2 S1 I0 F500 H1 T45 ; Set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned on

; Custom settings are not configured

[engikeneer]

@gforce one thing that jumps out there is you max speed of 25000mm/min (thats over 400mm/s). I would be very impressed if your printer could go that fast! I'm guessing your slicer is limiting the speed, but could it be that you've changed the limit in you slicer and it now gets into the higher speeds where torque drops off? Sounds unlikely from what you've described, but I though it worth mentioning.

[gforce]

@engikeneer Good observation! Yes I limit in my slicer to 65mm/sec for most top speed prints (16mm/sec in the z). I suppose I could change that in my next config when I update the firmware.

[dc42]

Check the M122 report to make sure that the VIN voltage is stable when the machine is skipping steps. Problems on Duet 2 powered machines that start after months or years of use are sometimes caused by either the PSU failing or the VIN terminal block connections no longer being sound.

[gforce]

@dc42 Very good info! I will check that out. Thank you very much.

[gforce]

Well I shut down the printer for a few days until I had time to try to recreate the problem.
After booting it up this morning I am getting a reoccurring Error: Over temperature shutdown on drivers 3. I haven't even turned anything on or done anything and the board is cold with a fan blowing on it.

I think this thing is shot. Ordered a new one from Filastruder who I bought from back in 2017. I will report back my findings.

[Veti]

@gforce said in 3500 hours on my printer now skipping steps like crazy:

M305 P0 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 0
M305 P1 T100000 B4138 C0 R4700 ; Set thermistor + ADC parameters for heater 1

also your thermistor settings are wrong. 4138 is most likely wrong for your thermistors

[gforce]

Hi guys,

I got a new duet wifi from filastruder and set it up with the latest firmware based on my old settings. Printing has been flawless. I put another 15 hours or so of printing and had no missed steps at all.

So apparently it was the old duet board. I'm happy with that. My biggest fear is that I would replace the board and find out that wasn't the problem.

I'm also pleased with the external antenna version that I got vs the onboard antenna version I had from 2017. My printer is metal and I made a mistake of buying the internal one. My connection to the network has been much more reliable. Im a happy printer.

Thank again for all the ideas and feedback you guys gave me. Hopefully this thread will be of help to someone in the future.

Here is to another 3000+ hours!

[Phaedrux]

That looks like a solid workhorse. Glad the new board is working well.