Posts made by Pakue

@dc42 I'll try that, but I don't think that is the issue in that case, as the M122 error also happens after the print is done and the heater is off.

@phaedrux Unfortunately, it still shows the same problems.

@dc42 Would it be any help to record the CAN bus transmission with a scope, or run a firmware version with more verbose logging?

@dc42 The issue still persists with 3.4rc2. I've also tried shortening the CAN cable without success.

M122 B20

m122 b20
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0rc2 (2022-02-22 10:15:02)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
All averaging filters OK
Never used RAM 2800, free system stack 88 words
Tasks: Move(notifyWait,0.0%,153) HEAT(notifyWait,0.2%,115) CanAsync(notifyWait,0.0%,65) CanRecv(notifyWait,0.0%,76) CanClock(notifyWait,0.0%,65) ACCEL(notifyWait,0.0%,61) TMC(delaying,3.0%,57) MAIN(running,91.9%,351) IDLE(ready,0.0%,26) AIN(delaying,4.9%,142), total 100.0%
Last reset 00:02:11 ago, cause: power up
Last software reset data not available
Driver 0: pos 0, 655.0 steps/mm,standstill, SG min 0, read errors 0, write errors 0, ifcnt 11, reads 243, writes 11, timeouts 0, DMA errors 0, CC errors 0, steps req 0 done 0
Moves scheduled 0, completed 0, in progress 0, hiccups 0, step errors 0, maxPrep 0, maxOverdue 0, maxInc 0, mcErrs 0, gcmErrs 0
Peak sync jitter 2/6, peak Rx sync delay 198, resyncs 0/0, no step interrupt scheduled
VIN voltage: min 23.8, current 24.0, max 24.1
MCU temperature: min 22.7C, current 31.4C, max 31.4C
M122: Last sensors broadcast 0x00000002 found 1 113 ticks ago, 0 ordering errs, loop time 0
CAN messages queued 1956, send tim
Response timeout: CAN addr 20, req type 6024, RID=18

M122 B20 (after a print)

m122 b20
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0rc2 (2022-02-22 10:15:02)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
All averaging filters OK
M122: Response timeout: CAN addr 20, req type 6024, RID=210

@bot I'd imagine it is easier (and more flexible) to reslice with a different parameter (serial number or similar), than it is to dynamically replace portions of existing gcode and handling it on the µC. Especially if the printer is running via an SBC that has more than enough compute power for slicing.

@bot Why not do it via a displacement map on the actual STL/3MF/mesh? That makes it very flexible to add other things instead of characters and is independent of the part surface.

@flobler Here is an older blog post from @dc42 with specs for 4.3 and 7 inch displays. I'd guess the 5 inch one is closer to the 4.3 inch in terms of power consumption.

It’s an interesting concept!
Given that the serial number should be supplied by a server, wouldn’t it be easier to request a new GCODE for each print? Adding serial number plates in a slicer world be much more flexible than adding it via RFF.

@dc42 Did you have success recreating the issue on your machine? On 3.4b7 the issue still persists.

@t3p3tony Upgrading the toolboard to the beta6 works, but after upgrading the MB6HC the M122 issue persists:

m122 b20
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
Never used RAM 2752, free system stack 2788 words
Tasks: Move(notifyWait,0.0%,153) HEAT(notifyWait,0.1%,101) CanAsync(notifyWait,0.0%,64) CanRecv(notifyWait,0.0%,77) CanClock(notifyWait,0.0%,64) ACCEL(notifyWait,0.0%,61) TMC(delaying,3.0%,67) MAIN(running,92.0%,350) IDLE(ready,0.0%,27) AIN(delaying,4.9%,148), total 100.0%
Last reset 00:00:20 ago, cause: software
Last software reset data not available
Driver 0: pos 0, 655.0 steps/mm,standstill, SG min 0, read errors 0, write errors 1, ifcnt 92, reads 10344, writes 11, timeouts 0, DMA errors 0, steps req 0 done 0
Moves scheduled 0, completed 0, in progress 0, hiccups 0, step errors 0, maxPrep 0, maxOverdue 0, maxInc 0, mcErrs 0, gcmErrs 0
Peak sync jitter 3/6, peak Rx sync delay 186, resyncs 0/0, no step interrupt scheduled
VIN voltage: min 23.8, current 24.0, max 24.1
MCU temperature: min 37.9C, current 38.1C, max 38.2C
M122: Last sensors broadcast 0x00000002 found 1 246 ticks ago, 0 ordering errs, loop time 0
CAN messages queued 264, send time
Response timeout: CAN addr 20, req type 6024, RID=17

@t3p3tony Updating via CAN it gets stuck on "Please wait while updates are being installed..." and the toolboard only shows up again after downgrading the MB6HC to 3.3.
Even resetting the toolboard (both buttons pressed while powering up) doesn't reset it to the original address (121).

V3.3 on the MB6HC returns the full M122 as far as I can tell

M122 B20
Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
Never used RAM 2752, free system stack 2788 words
Tasks: Move(notifyWait,0.0%,153) HEAT(notifyWait,0.2%,115) CanAsync(notifyWait,0.0%,64) CanRecv(notifyWait,0.0%,77) CanClock(notifyWait,0.0%,64) ACCEL(notifyWait,0.0%,61) TMC(delaying,3.0%,57) MAIN(running,91.8%,340) IDLE(ready,0.0%,27) AIN(delaying,4.9%,142), total 100.0%
Last reset 00:03:20 ago, cause: software
Last software reset data not available
Driver 0: pos 0, 655.0 steps/mm,standstill, SG min 0, read errors 0, write errors 1, ifcnt 23, reads 34732, writes 13, timeouts 0, DMA errors 0, steps req 0 done 0
Moves scheduled 0, completed 0, in progress 0, hiccups 0, step errors 0, maxPrep 0, maxOverdue 0, maxInc 0, mcErrs 0, gcmErrs 0
Peak sync jitter 2/6, peak Rx sync delay 212, resyncs 0/0, no step interrupt scheduled
VIN voltage: min 23.8, current 24.0, max 24.1
MCU temperature: min 37.2C, current 37.7C, max 37.8C
Last sensors broadcast 0x00000002 found 1 100 ticks ago, 0 ordering errs, loop time 0
CAN messages queued 4005, send timeouts 0, received 1804, lost 0, free buffers 37, min 37, error reg 0
dup 0, oos 0/0/0/0, bm 0, wbm 0, rxMotionDelay 0
Accelerometer detected: yes, status: 00
I2C bus errors 0, naks 3, other errors 0

M122

M122
=== Diagnostics ===
RepRapFirmware for Duet 3 MB6HC version 3.3 (2021-06-15 21:45:47) running on Duet 3 MB6HC v1.01 or later (SBC mode)
Board ID: 08DJM-956BA-NA3TJ-6J9F6-3SD6M-TB96T
Used output buffers: 1 of 40 (10 max)
=== RTOS ===
Static ram: 150904
Dynamic ram: 61580 of which 640 recycled
Never used RAM 141068, free system stack 200 words
Tasks: SBC(ready,17.9%,346) HEAT(delaying,0.0%,325) Move(notifyWait,0.0%,302) CanReceiv(notifyWait,0.0%,774) CanSender(notifyWait,0.0%,374) CanClock(delaying,0.0%,339) TMC(notifyWait,7.3%,93) MAIN(running,74.7%,922) IDLE(ready,0.0%,29), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 00:05:21 ago, cause: software
Last software reset at 2021-11-29 23:23, reason: User, none spinning, available RAM 141068, slot 0
Software reset code 0x0012 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0044a000 BFAR 0x00000000 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x00
Step timer max interval 148
MCU temperature: min 43.8, current 44.4, max 44.7
Supply voltage: min 23.6, current 24.0, max 24.1, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.1, current 12.1, max 12.2, under voltage events: 0
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Driver 0: position 0, standstill, reads 28365, writes 11 timeouts 0, SG min/max 0/0
Driver 1: position 0, standstill, reads 28360, writes 16 timeouts 0, SG min/max 0/0
Driver 2: position 0, standstill, reads 28360, writes 16 timeouts 0, SG min/max 0/0
Driver 3: position 0, standstill, reads 28362, writes 14 timeouts 0, SG min/max 0/0
Driver 4: position 0, standstill, reads 28362, writes 14 timeouts 0, SG min/max 0/0
Driver 5: position 0, standstill, reads 28363, writes 14 timeouts 0, SG min/max 0/0
Date/time: 2021-11-29 23:28:40
Slowest loop: 26.00ms; fastest: 0.05ms
=== Storage ===
Free file entries: 10
SD card 0 not detected, interface speed: 37.5MBytes/sec
SD card longest read time 0.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 125, maxWait 0ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== CAN ===
Messages queued 2896, received 6434, lost 0, longest wait 4ms for reply type 6024, peak Tx sync delay 464, free buffers 49 (min 48), ts 1610/1609/0
Tx timeouts 0,0,0,0,0,0
=== SBC interface ===
State: 4, failed transfers: 0, checksum errors: 0
Last transfer: 2ms ago
RX/TX seq numbers: 51414/51414
SPI underruns 0, overruns 0
Disconnects: 0, timeouts: 0, IAP RAM available 0x2c83c
Buffer RX/TX: 0/0-0
=== Duet Control Server ===
Duet Control Server v3.4-b6
Code buffer space: 4096
Configured SPI speed: 8000000Hz, TfrRdy pin glitches: 0
Full transfers per second: 3846.85, max wait times: 18.1ms/20.2ms
Codes per second: 0.20
Maximum length of RX/TX data transfers: 2940/800

@dc42 DC offsets between toolboard GND and Duet3 GND input are

• 17mV default
• 33mV with bed heater on
• 430mV with hotend on

For noise measurements I'd have to pull out the scope.

After a print once everything is turned off (fans, heater, etc.) the M122 still throws errors, so I'm guessing noise is not the root cause?

m122 b20
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
M122: Response timeout: CAN addr 20, req type 6024, RID=234

@dc42 that one is running 0.9mm extrusion width on a 0.4 nozzle, but I can slice it with standard settings if preferred. The issue is reproducible on other settings too.

Standard_Box v19.gcode

@dc42 I do indeed have a ~300W 24V heated bed, but the wires are >2mm^2, 30cm in length and split at the PSU between heated bed and the rest of the electronics. I can measure the GND offset/noise at the toolboard when everything is heating up to double check.

The M122 seems to be unreliable during printing, but works (at least sends some data) when the printer just started. About after a print; I'd have to check that.

With RFF 3.3 the M122 doesn't show errors.

@jay_s_uk I can try to shorten the CAN cable and add some shielding. Let's see if that helps.

@jay_s_uk It's printing fine except for the missed extrusions. Wouldn't signalling errors be caught by the CAN "lost" counter?

@jay_s_uk unfortunately a similar result.

M122 b20
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
M122: Response timeout: CAN addr 20, req type 6024, RID=189

after M122

M122
=== Diagnostics ===
RepRapFirmware for Duet 3 MB6HC version 3.4.0beta6 (2021-11-06 11:38:57) running on Duet 3 MB6HC v1.01 or later (SBC mode)
Board ID: 08DJM-956BA-NA3TJ-6J9F6-3SD6M-TB96T
Used output buffers: 1 of 40 (12 max)
=== RTOS ===
Static ram: 151136
Dynamic ram: 65936 of which 580 recycled
Never used RAM 129156, free system stack 127 words
Tasks: SBC(ready,0.6%,476) HEAT(notifyWait,0.0%,320) Move(notifyWait,0.1%,252) CanReceiv(notifyWait,0.0%,771) CanSender(notifyWait,0.0%,365) CanClock(delaying,0.0%,340) TMC(notifyWait,7.5%,58) MAIN(running,91.6%,921) IDLE(ready,0.2%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 00:45:38 ago, cause: power up
Last software reset at 2021-11-28 23:28, reason: User, none spinning, available RAM 143092, slot 1
Software reset code 0x0012 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0044a000 BFAR 0x00000000 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x00
Step timer max interval 133
MCU temperature: min 22.5, current 44.4, max 44.9
Supply voltage: min 23.4, current 23.9, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.1, current 12.1, max 12.2, under voltage events: 0
Heap OK, handles allocated/used 99/2, heap memory allocated/used/recyclable 2048/72/0, gc cycles 0
Driver 0: pos 20093, standstill, SG min 0, mspos 8, reads 29477, writes 11 timeouts 0
Driver 1: pos -3588, ok, SG min 0, mspos 394, reads 29464, writes 24 timeouts 0
Driver 2: pos 845, standstill, SG min 0, mspos 888, reads 29464, writes 24 timeouts 0
Driver 3: pos 0, ok, SG min 0, mspos 339, reads 29471, writes 17 timeouts 0
Driver 4: pos 0, ok, SG min 0, mspos 339, reads 29472, writes 17 timeouts 0
Driver 5: pos 0, ok, SG min 0, mspos 339, reads 29472, writes 17 timeouts 0
Date/time: 2021-11-29 16:52:26
Slowest loop: 1002.34ms; fastest: 0.04ms
=== Storage ===
Free file entries: 10
SD card 0 not detected, interface speed: 37.5MBytes/sec
SD card longest read time 0.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 125, segments created 42, maxWait 2340188ms, bed compensation in use: mesh, comp offset 0.000
=== MainDDARing ===
Scheduled moves 2057, completed 2052, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state 3
=== AuxDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
Heater 0 is on, I-accum = 0.7
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 1
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File* is doing "G1 X105.864998 Y148.003998 E156.572769" in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue* is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty
=== CAN ===
Messages queued 26681, received 43884, lost 0, longest wait 2ms for reply type 6049, peak Tx sync delay 1113, free buffers 49 (min 43), ts 13692/13667/0
Tx timeouts 0,0,0,0,0,0
=== SBC interface ===
Transfer state: 4, failed transfers: 0, checksum errors: 0
RX/TX seq numbers: 42985/42985
SPI underruns 0, overruns 0
State: 5, disconnects: 0, timeouts: 0, IAP RAM available 0x2b6b8
Buffer RX/TX: 1536/3080-0
=== Duet Control Server ===
Duet Control Server v3.4-b6
File /opt/dsf/sd/gcodes/Standard_Box v23.gcode is selected, processing
File:
Buffered code: G1 X105.865 Y148.004 E156.57277
Buffered code: G1 X106.767 Y148.004 E156.64097
Buffered code: G1 X143.747 Y111.023 E160.59435
Buffered code: G1 X143.747 Y111.925 E160.66254
Buffered code: G1 X107.669 Y148.004 E164.51948
Buffered code: G1 X108.571 Y148.004 E164.58768
Buffered code: G1 X143.748 Y112.828 E168.34819
Buffered code: G1 X143.748 Y113.730 E168.41638
Buffered code: G1 X109.473 Y148.004 E172.08047
Buffered code: G1 X110.376 Y148.004 E172.14866
Buffered code: G1 X143.748 Y114.632 E175.71632
Buffered code: G1 X143.748 Y115.534 E175.78451
Buffered code: G1 X111.278 Y148.004 E179.25572
Buffered code: G1 X112.180 Y148.004 E179.32392
Buffered code: G1 X143.748 Y116.436 E182.69871
Buffered code: G1 X143.748 Y117.338 E182.76690
Buffered code: G1 X113.082 Y148.004 E186.04526
Buffered code: G1 X113.984 Y148.004 E186.11346
Buffered code: G1 X143.749 Y118.240 E189.29538
Buffered code: G1 X143.749 Y119.142 E189.36357
Buffered code: G1 X114.887 Y148.004 E192.44907
Buffered code: G1 X115.789 Y148.004 E192.51726
Buffered code: G1 X143.749 Y120.044 E195.50633
Buffered code: G1 X143.749 Y120.946 E195.57452
Buffered code: G1 X116.691 Y148.004 E198.46715
Buffered code: G1 X117.593 Y148.004 E198.53535
Buffered code: G1 X143.749 Y121.848 E201.33155
Buffered code: G1 X143.749 Y122.750 E201.39974
Buffered code: G1 X118.495 Y148.004 E204.09950
Buffered code: G1 X119.397 Y148.004 E204.16770
Buffered code: G1 X143.749 Y123.652 E206.77104
Buffered code: G1 X143.750 Y124.555 E206.83923
==> 1536 bytes
Code buffer space: 1416
Configured SPI speed: 8000000Hz, TfrRdy pin glitches: 0
Full transfers per second: 2.77, max wait times: 36.6ms/10.0ms
Codes per second: 0.15
Maximum length of RX/TX data transfers: 3040/1508

@t3p3tony

This is now right after a line was skipped:

M122 M122 B20
=== Diagnostics ===
RepRapFirmware for Duet 3 MB6HC version 3.4.0beta6 (2021-11-06 11:38:57) running on Duet 3 MB6HC v1.01 or later (SBC mode)
Board ID: 08DJM-956BA-NA3TJ-6J9F6-3SD6M-TB96T
Used output buffers: 1 of 40 (12 max)
=== RTOS ===
Static ram: 151136
Dynamic ram: 65936 of which 580 recycled
Never used RAM 131988, free system stack 128 words
Tasks: SBC(ready,0.6%,498) HEAT(notifyWait,0.0%,320) Move(notifyWait,0.2%,239) CanReceiv(notifyWait,0.0%,771) CanSender(notifyWait,0.0%,365) CanClock(delaying,0.0%,340) TMC(notifyWait,8.3%,58) MAIN(running,89.0%,921) IDLE(ready,1.8%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 02:14:27 ago, cause: software
Last software reset at 2021-11-28 23:28, reason: User, none spinning, available RAM 143092, slot 1
Software reset code 0x0012 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0044a000 BFAR 0x00000000 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x00
Step timer max interval 132
MCU temperature: min 45.8, current 46.6, max 46.7
Supply voltage: min 23.7, current 23.8, max 24.0, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.1, current 12.1, max 12.1, under voltage events: 0
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Driver 0: pos 21605, standstill, SG min n/a, mspos 8, reads 21585, writes 0 timeouts 0
Driver 1: pos 5882, standstill, SG min 0, mspos 824, reads 21580, writes 6 timeouts 0
Driver 2: pos 427, ok, SG min 0, mspos 442, reads 21580, writes 6 timeouts 0
Driver 3: pos 0, ok, SG min 0, mspos 580, reads 21583, writes 2 timeouts 0
Driver 4: pos 0, ok, SG min 0, mspos 580, reads 21583, writes 2 timeouts 0
Driver 5: pos 0, ok, SG min 0, mspos 580, reads 21583, writes 2 timeouts 0
Date/time: 2021-11-29 01:56:56
Slowest loop: 1002.25ms; fastest: 0.04ms
=== Storage ===
Free file entries: 10
SD card 0 not detected, interface speed: 37.5MBytes/sec
SD card longest read time 0.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 125, segments created 43, maxWait 349053ms, bed compensation in use: mesh, comp offset 0.000
=== MainDDARing ===
Scheduled moves 286, completed 281, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state 3
=== AuxDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
Heater 0 is on, I-accum = 1.0
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 1
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File* is doing "G1 X171.792999 Y100.209000 E36.715832" in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue* is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty
=== CAN ===
Messages queued 2903, received 4697, lost 0, longest wait 2ms for reply type 6024, peak Tx sync delay 109, free buffers 49 (min 47), ts 1390/1387/0
Tx timeouts 0,0,0,0,0,0
=== SBC interface ===
Transfer state: 4, failed transfers: 0, checksum errors: 0
RX/TX seq numbers: 53035/53035
SPI underruns 0, overruns 0
State: 5, disconnects: 1, timeouts: 1, IAP RAM available 0x2b68c
Buffer RX/TX: 1584/3096-0
=== Duet Control Server ===
Duet Control Server v3.4-b6
File /opt/dsf/sd/gcodes/Tray.gcode is selected, processing
File:
Buffered code: G1 X171.793 Y100.209 E36.71583
Buffered code: G1 X171.793 Y100.855 E36.73919
Buffered code: G1 X139.986 Y69.048 E38.36396
Buffered code: G1 X139.339 Y69.048 E38.38732
Buffered code: G1 X171.793 Y101.502 E40.04512
Buffered code: G1 X171.793 Y102.149 E40.06848
Buffered code: G1 X138.693 Y69.048 E41.75931
Buffered code: G1 X138.046 Y69.048 E41.78267
Buffered code: G1 X171.793 Y102.795 E43.50654
Buffered code: G1 X171.793 Y103.442 E43.52990
Buffered code: G1 X137.399 Y69.048 E45.28680
Buffered code: G1 X136.753 Y69.048 E45.31016
Buffered code: G1 X171.793 Y104.089 E47.10009
Buffered code: G1 X171.793 Y104.735 E47.12345
Buffered code: G1 X136.106 Y69.048 E48.94642
Buffered code: G1 X135.459 Y69.048 E48.96977
Buffered code: G1 X171.793 Y105.382 E50.82577
Buffered code: G1 X171.793 Y106.028 E50.84913
Buffered code: G1 X135.007 Y69.242 E52.72823
Buffered code: G1 X135.007 Y69.889 E52.75159
Buffered code: G1 X171.793 Y106.675 E54.63069
Buffered code: G1 X171.793 Y107.322 E54.65405
Buffered code: G1 X135.007 Y70.536 E56.53315
Buffered code: G1 X135.007 Y71.182 E56.55651
Buffered code: G1 X171.793 Y107.968 E58.43561
Buffered code: G1 X171.793 Y108.615 E58.45897
Buffered code: G1 X135.007 Y71.829 E60.33807
Buffered code: G1 X135.007 Y72.476 E60.36143
Buffered code: G1 X171.793 Y109.262 E62.24053
Buffered code: G1 X171.793 Y109.908 E62.26389
Buffered code: G1 X135.007 Y73.122 E64.14299
Buffered code: G1 X135.007 Y73.769 E64.16635
==> 1536 bytes
Code buffer space: 1464
Configured SPI speed: 8000000Hz, TfrRdy pin glitches: 0
Full transfers per second: 40.10, max wait times: 54.1ms/1.9ms
Codes per second: 14.88
Maximum length of RX/TX data transfers: 3212/1664
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
M122: Response timeout: CAN addr 20, req type 6024, RID=439

@t3p3tony
That's during printing. I can try to get an M122 right after a line is skipped.

m122
=== Diagnostics ===
RepRapFirmware for Duet 3 MB6HC version 3.4.0beta6 (2021-11-06 11:38:57) running on Duet 3 MB6HC v1.01 or later (SBC mode)
Board ID: 08DJM-956BA-NA3TJ-6J9F6-3SD6M-TB96T
Used output buffers: 1 of 40 (12 max)
=== RTOS ===
Static ram: 151136
Dynamic ram: 65936 of which 580 recycled
Never used RAM 132060, free system stack 140 words
Tasks: SBC(ready,0.6%,498) HEAT(notifyWait,0.0%,320) Move(notifyWait,0.6%,250) CanReceiv(notifyWait,0.0%,771) CanSender(notifyWait,0.0%,365) CanClock(delaying,0.0%,340) TMC(notifyWait,8.1%,58) MAIN(running,90.4%,921) IDLE(ready,0.2%,30), total 100.0%
Owned mutexes: HTTP(MAIN)
=== Platform ===
Last reset 00:53:55 ago, cause: software
Last software reset at 2021-11-28 23:28, reason: User, none spinning, available RAM 143092, slot 1
Software reset code 0x0012 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0044a000 BFAR 0x00000000 SP 0x00000000 Task SBC Freestk 0 n/a
Error status: 0x00
Step timer max interval 139
MCU temperature: min 41.9, current 45.5, max 46.0
Supply voltage: min 23.6, current 23.9, max 24.1, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.1, current 12.1, max 12.2, under voltage events: 0
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Driver 0: pos 28052, standstill, SG min 0, mspos 8, reads 16451, writes 11 timeouts 0
Driver 1: pos -716, ok, SG min 0, mspos 815, reads 16426, writes 36 timeouts 0
Driver 2: pos 7376, ok, SG min 0, mspos 616, reads 16426, writes 36 timeouts 0
Driver 3: pos 0, ok, SG min 0, mspos 977, reads 16441, writes 21 timeouts 0
Driver 4: pos 0, ok, SG min 0, mspos 977, reads 16441, writes 21 timeouts 0
Driver 5: pos 0, ok, SG min 0, mspos 977, reads 16442, writes 21 timeouts 0
Date/time: 2021-11-29 00:36:24
Slowest loop: 1021.09ms; fastest: 0.04ms
=== Storage ===
Free file entries: 10
SD card 0 not detected, interface speed: 37.5MBytes/sec
SD card longest read time 0.0ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 125, segments created 40, maxWait 462853ms, bed compensation in use: mesh, comp offset 0.000
=== MainDDARing ===
Scheduled moves 9065, completed 9005, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 2], CDDA state 3
=== AuxDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
Heater 0 is on, I-accum = 0.7
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 1
Movement lock held by null
HTTP* is doing "M122" in state(s) 0
Telnet is idle in state(s) 0
File* is doing "G1 X154.501007 Y179.203003 E93.792648" in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger* is idle in state(s) 0
Queue* is idle in state(s) 0
LCD is idle in state(s) 0
SBC is idle in state(s) 0
Daemon is idle in state(s) 0
Aux2 is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty
=== CAN ===
Messages queued 37362, received 52073, lost 0, longest wait 5ms for reply type 6024, peak Tx sync delay 3539, free buffers 49 (min 46), ts 16179/16118/0
Tx timeouts 0,0,0,0,0,0
=== SBC interface ===
Transfer state: 4, failed transfers: 0, checksum errors: 0
RX/TX seq numbers: 58087/58087
SPI underruns 0, overruns 0
State: 5, disconnects: 1, timeouts: 1, IAP RAM available 0x2b68c
Buffer RX/TX: 3968/1368-4064
=== Duet Control Server ===
Duet Control Server v3.4-b6
File /opt/dsf/sd/gcodes/Tray.gcode is selected, processing
File:
Buffered code: G1 X154.076 Y179.628 E93.81991
Buffered code: G1 X153.529 Y179.628 E93.84469
Buffered code: G1 X153.954 Y179.203 E93.87195
Buffered code: G1 X153.407 Y179.203 E93.89673
Buffered code: G1 X152.982 Y179.628 E93.92399
Buffered code: G1 X152.435 Y179.628 E93.94877
Buffered code: G1 X152.861 Y179.203 E93.97603
Buffered code: G1 X152.314 Y179.203 E94.00081
Buffered code: G1 X151.889 Y179.628 E94.02807
Buffered code: G1 X151.342 Y179.628 E94.05285
Buffered code: G1 X151.767 Y179.203 E94.08011
Buffered code: G1 X151.220 Y179.203 E94.10489
Buffered code: G1 X150.795 Y179.628 E94.13215
Buffered code: G1 X150.248 Y179.628 E94.15693
Buffered code: G1 X150.673 Y179.203 E94.18418
Buffered code: G1 X150.127 Y179.203 E94.20896
Buffered code: G1 X149.701 Y179.628 E94.23622
Buffered code: G1 X149.155 Y179.628 E94.26100
Buffered code: G1 X149.580 Y179.203 E94.28826
Buffered code: G1 X149.033 Y179.203 E94.31304
Buffered code: G1 X148.608 Y179.628 E94.34030
Buffered code: G1 X148.061 Y179.628 E94.36508
Buffered code: G1 X148.486 Y179.203 E94.39234
Buffered code: G1 X147.940 Y179.203 E94.41712
Buffered code: G1 X147.514 Y179.628 E94.44438
Buffered code: G1 X146.967 Y179.628 E94.46916
Buffered code: G1 X147.393 Y179.203 E94.49642
Buffered code: G1 X146.846 Y179.203 E94.52120
Buffered code: G1 X146.421 Y179.628 E94.54846
Buffered code: G1 X145.874 Y179.628 E94.57324
Buffered code: G1 X146.299 Y179.203 E94.60049
==> 1488 bytes
Pending code: G1 X145.752 Y179.203 E94.62527
Code buffer space: 2600
Configured SPI speed: 8000000Hz, TfrRdy pin glitches: 0
Full transfers per second: 39.63, max wait times: 80.8ms/11.0ms
Codes per second: 4.35
Maximum length of RX/TX data transfers: 3212/1196

I've noticed, that the toolboard extruder sometimes misses gcode commands which results in missing infill lines. The problem is not hardware related, as the "skips" are always an entire (straight) line without stepper stalls and independent of extrusion speed and temperature. It seems random in its occurrence.
M122 for the toolboard throws an error, but still prints part of the board info. When running the mainboard on 3.3 M122 works fine.

Is there a way to check for CAN bus signal integrity?

I'm pretty sure that I've seen that issue also on beta4, but only now tracked it down further.

M122 B20

M122 B20
Error: Diagnostics for board 20:
Duet TOOL1LC rev 1.1 or later firmware version 3.4.0beta6 (2021-11-06 11:56:11)
Bootloader ID: SAMC21 bootloader version 2.3 (2021-01-26b1)
Never used RAM 2752, free system stack 2788 words
Tasks: Move(notifyWait,0.0%,153) HEAT(notifyWait,0.1%,101) CanAsync(notifyWait,0.0%,64) CanRecv(notifyWait,0.0%,77) CanClock(notifyWait,0.0%,64) ACCEL(notifyWait,0.0%,61) TMC(delaying,3.0%,57) MAIN(running,91.9%,350) IDLE(ready,0.0%,27) AIN(delaying,4.9%,142), total 100.0%
Last reset 00:09:05 ago, cause: software
Last software reset data not available
Driver 0: pos 0, 655.0 steps/mm,standstill, SG min 0, read errors 0, write errors 0, ifcnt 24, reads 14688, writes 0, timeouts 0, DMA errors 0, steps req 0 done 0
Moves scheduled 0, completed 0, in progress 0, hiccups 0, step errors 0, maxPrep 0, maxOverdue 0, maxInc 0, mcErrs 0, gcmErrs 0
Peak sync jitter 2/12, peak Rx sync delay 210, resyncs 0/0, no step interrupt scheduled
VIN voltage: min 23.0, current 23.0, max 23.9
MCU temperature: min 37.2C, current 37.5C, max 37.7C
M122: Response timeout: CAN addr 20, req type 6024, RID=29

Config.g

; Configuration file for Duet 3 (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Nov 14 2020 08:19:21 GMT+0100 (CET)

G4 S1   ;wait for expansion boards to start
; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"Duet 3"                               ; set printer name
M669 K1                                      ; select CoreXY mode

; Drives
M569 P20.0 S0                                ; toolboard drive 0.0 goes forwards 
M569 P0.1 S1 D2                              ; physical drive 0.1 goes forwards
M569 P0.2 S0 D2                              ; physical drive 0.2 goes forwards
M569 P0.3 S1                                 ; physical drive 0.3 goes forwards
M569 P0.4 S1                                 ; physical drive 0.4 goes forwards
M569 P0.5 S1                                 ; physical drive 0.5 goes forwards
M584 X0.2 Y0.1 Z0.3:4:5 E20.0                ; set drive mapping
M350 X16 Y16 Z16 E16 I1                      ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z1600.00 E655              ; set steps per mm
M566 X1000.00 Y1000.00 Z50.00 E600.00 P1     ; set maximum instantaneous speed changes (mm/min)
M203 X60000.00 Y60000.00 Z400.00 E3600.00    ; set maximum speeds (mm/min)
M201 X10000.00 Y10000.00 Z80.00 E600.00      ; set accelerations (mm/s^2)
M906 X1600 Y1600 Z800 E450 I30               ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                      ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 S1                             ; set axis minima
M208 X300 Y250 Z200 S0                       ; set axis maxima

; Endstops
M574 X1 S3                                   ; configure sensorless endstop for low end on X
M574 Y1 S3                                   ; configure sensorless endstop for low end on Y
M574 Z1 S2                                   ; configure Z-probe endstop for low end on Z
M915 X Y R0 F0 S3 H200 	                     ; enable sensorless homing

; Z-Probe
M558 P9 C"20.io0.in" H3 F200 T15000 A4 S0.02    ; set Z probe type to bltouch and the dive height + speeds
M950 S0 C"20.io0.out"
G31 X0 Y-20.0 Z3.10 P25                        ; set Z probe trigger value, offset and trigger height
M671 X-8:295:144 Y-15:-15:290 S10             ; leadscrews at front left, front right and rear middle
M557 X10:290 Y0:230 P4:4                    ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                           ; create bed heater output on out0 and map it to sensor 0
M307 H0 B0 S1.00                             ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                      ; map heated bed to heater 0
M143 H0 S120                                 ; set temperature limit for heater 0 to 120C
M308 S1 P"20.temp0" Y"pt1000"                   ; configure sensor 1 as PT1000 on pin temp1
M950 H1 C"20.out0" T1                           ; create nozzle heater output on out1 and map it to sensor 1
;M307 H1 B0 S1.00                             ; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"out1" Q1000                           ; create fan 0 on pin out7 and set its frequency
M106 P0 S0 H-1                               ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"out2" Q1000                           ; create fan 1 on pin out8 and set its frequency
M106 P1 S1 H1 T50                            ; set fan 1 value. Thermostatic control is turned on

; Tools
M563 P0 D0 H1 F0                             ; define tool 0
G10 P0 X0 Y0 Z0                              ; set tool 0 axis offsets
G10 P0 R0 S0                                 ; set initial tool 0 active and standby temperatures to 0C

; Accelerometer
; M955 P20.0 I20								 ; Acc. on tool board CAN 20 with orientation 20

; Miscellaneous
M501                                         ; load saved parameters from non-volatile memory
T0                                           ; select first tool