Duet3 6CH + 3CH expansion board - Missing steps.

deckingman

@Phaedrux Confused now . DC wrote earlier today quote "please upgrade to 3.2RC2, or wait a few days for the release of 3.2 stable."

Phaedrux

I guess things progressed more smoothly than anticipated?

evomotors

@deckingman
Well, 3.2 is official stable now.

deckingman

@evomotors That's the quickest few days I've ever come across Let me know if it fixes your problem - then I'll give it a shot myself.

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42
Is it really going to be out in a few days?

It's out already.

Issue is not fixed!

M122 B1
Diagnostics for board 1:
Duet EXP3HC firmware version 3.2 (2021-01-05)
Bootloader ID: not available
Never used RAM 154848, free system stack 158 words
HEAT 90 CanAsync 94 CanRecv 84 TMC 30 MAIN 305 AIN 257
Last reset 01:37:18 ago, cause: power up
Last software reset data not available
Driver 0: position 0, 80.0 steps/mm,  standstill, reads 36849, writes 11 timeouts 0, SG min/max 0/0
Driver 1: position 226160, 344.0 steps/mm,  ok, reads 36831, writes 32 timeouts 0, SG min/max 0/1013
Driver 2: position 0, 80.0 steps/mm,  standstill, reads 36855, writes 11 timeouts 0, SG min/max 0/0
Moves scheduled 15696, completed 15694, in progress 1, hiccups 380
Next step interrupt due in 3606 ticks, enabled
VIN: 24.6V, V12: 12.3V
MCU temperature: min 43.8C, current 44.0C, max 44.2C
Ticks since heat task active 228, ADC conversions started 5838220, completed 5838219, timed out 0
Last sensors broadcast 0x00000000 found 0 232 ticks ago, loop time 0
CAN messages queued 35, send timeouts 0, received 68218, lost 0, free buffers 36

evomotors

Should I change something else in the config? CAN bus timing?

dc42

I presume you are referring to the hiccup rate. It looks like the hiccup rate has reduced from 1 hiccup every ~5.6 moves to 1 hiccup every 41 moves. That's a seven-fold improvement!

Hiccups are not lost steps, they are delayed steps. The delay may be only a few microseconds.

I am still a little surprised that the hiccup rate is not lower. What speed are you printing at, and what nozzle size are you using?

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

I presume you are referring to the hiccup rate. It looks like the hiccup rate has reduced from 1 hiccup every ~5.6 moves to 1 hiccup every 41 moves. That's a seven-fold improvement!

Hiccups are not lost steps, they are delayed steps. The delay may be only a few microseconds.

I am still a little surprised that the hiccup rate is not lower. What speed are you printing at, and what nozzle size are you using?

BMG direct drive extruder, 1/16 micro-stepping
0.4 nozzle
Current print speed 40mm/s perimeters (looks beautiful), 80mm/s infill (look like crap)

When extruder connected directly to Duet3 I print perimeters and infill at < 200mm/s without issues.

evomotors

@dc42 said in Duet3 6CH + 3CH expansion board - Missing steps.:

I presume you are referring to the hiccup rate. It looks like the hiccup rate has reduced from 1 hiccup every ~5.6 moves to 1 hiccup every 41 moves. That's a seven-fold improvement!

Hiccups are not lost steps, they are delayed steps. The delay may be only a few microseconds.

I am still a little surprised that the hiccup rate is not lower. What speed are you printing at, and what nozzle size are you using?

Sorry @dc42, but it looks like missing steps if you looking on the print.

dc42

You haven't shown us the print! What makes you think whatever print problems you are seeing are caused by the hiccups? If it is, then presumably the problem is only 1/7 as bad as it was before.

dc42

PS:

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

Driver 1: position 226160, 344.0 steps/mm, ok, reads 36831, writes 32 timeouts 0, SG min/max 0/1013

The fact that the SG min is zero suggests to me that the moor may be stalling. What model of motor is it, and what motor current are you using? Are you sure the hot end temperature is high enough for the filament?

evomotors

@dc42
Like I say if I plug in extruder to main (Duet3) board, extruder works as it should.

evomotors

@dc42

This is diagnostics from Duet3 board

Supply voltage: min 24.0, current 24.3, max 24.4, under voltage events: 0, over voltage events: 0, power good: yes
12V rail voltage: min 12.1, current 12.2, max 12.2, under voltage events: 0
Driver 0: position 74917, standstill, reads 2634, writes 6 timeouts 0, SG min/max 0/250
Driver 1: position 2790, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/237
Driver 2: position 545, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/254
Driver 3: position 0, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/266
Driver 4: position 0, ok, reads 2639, writes 2 timeouts 0, SG min/max 0/1023
Driver 5: position 0, ok, reads 2639, writes 2 timeouts 0, SG min/max 0/1023

If SG min 0 means that motors stalling, than all my motors are stalling.....

evomotors

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

Driver 0: position 74917, standstill, reads 2634, writes 6 timeouts 0, SG min/max 0/250 Driver 1: position 2790, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/237 Driver 2: position 545, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/254 Driver 3: position 0, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/266

Also this looks like B.S. these are my Z motors, how they could have different positions?

Driver 0: position 74917, standstill, reads 2634, writes 6 timeouts 0, SG min/max 0/250
Driver 1: position 2790, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/237
Driver 2: position 545, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/254
Driver 3: position 0, standstill, reads 2635, writes 6 timeouts 0, SG min/max 0/266

evomotors

@dc42
Motor is E3D-Online came with TitanAqua extruder. Temperature is 270c, I think for ABS is more than enough ...

deckingman

@evomotors When I've seen hiccups on extruders, it's always been retract/unretract moves that cause it, because the extruder moves much faster doing those moves than it does during printing. For example, during print moves the extruder moves are typically in the order of 5% of the carriage move (depending on nozzle size and layer height of course). So if you printed at say 100mm/sec, then the extruder speed would typically be about 5mm/sec. I note that you use firmware retraction and have it sec to 1800mm/sec.
So just as a test, try halving that to 900mm/sec which ought to cure the hiccups. If it does, but the print quality is not improved, then you know it's not a firmware issue.

dc42

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@dc42
Like I say if I plug in extruder to main (Duet3) board, extruder works as it should.

Please can you provide the following:

A photo of a print, done with the extruder connected to the main board, running RRF 3.2.
The config.g file you used to produce the print in #1.
A photo of the same print, done with the extruder connected to the EXP3HC, running RRF 3.2 on both boards.
The config.g file you used to produce the print in #3, along with M122 reports for both the main board and the EXP3HC [EDIT: taken when the print has completed].
The GCode file you used to produce the prints.

I will then try to replicate and investigate this issue.

As @deckingman says, it is most likely retractions and reprimes that are causing the hiccups, however unless your steps/mm for that extruder is very high then I would not expect to see a significant number of hiccups on a 3HC.

deckingman

@evomotors The other thing that strikes me as odd (although it should help with hiccups) is that you steps per mm for the extruder looks low (I have 6 Bondetch BMGs). Mine are all around 410 - 415 and Bondtech suggest using 415 but yours is set to 344. How did you arrive at that figure?

I hesitate to suggest this but it seems to me that you might be having extrusion problems due to incorrectly calibrated extruder, which might appear as missed steps and that the hiccups are a "red herring". (But that does not explain why the extruder connected to the main board appears to act differently - unless you change the steps per mm as well as the driver number when swapping between boards)?

evomotors

@deckingman said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors When I've seen hiccups on extruders, it's always been retract/unretract moves that cause it, because the extruder moves much faster doing those moves than it does during printing. For example, during print moves the extruder moves are typically in the order of 5% of the carriage move (depending on nozzle size and layer height of course). So if you printed at say 100mm/sec, then the extruder speed would typically be about 5mm/sec. I note that you use firmware retraction and have it sec to 1800mm/sec.
So just as a test, try halving that to 900mm/sec which ought to cure the hiccups. If it does, but the print quality is not improved, then you know it's not a firmware issue.

Firmware retraction speed is in mm/min not mm/s, so my 1800 is equal to 30mm/s

deckingman

@evomotors said in Duet3 6CH + 3CH expansion board - Missing steps.:

@deckingman said in Duet3 6CH + 3CH expansion board - Missing steps.:

@evomotors When I've seen hiccups on extruders, it's always been retract/unretract moves that cause it, because the extruder moves much faster doing those moves than it does during printing. For example, during print moves the extruder moves are typically in the order of 5% of the carriage move (depending on nozzle size and layer height of course). So if you printed at say 100mm/sec, then the extruder speed would typically be about 5mm/sec. I note that you use firmware retraction and have it sec to 1800mm/sec.
So just as a test, try halving that to 900mm/sec which ought to cure the hiccups. If it does, but the print quality is not improved, then you know it's not a firmware issue.

Firmware retraction speed is in mm/min not mm/s, so my 1800 is equal to 30mm/s

Yes I know. But that's still around 6 times faster than what you'll see doing print moves when printing at 100mm/sec carriage speed where the extruder would be running at about 5 mm/sec. Hence my suggestion to try it at 900mm/min (15mm/sec).