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

evomotors

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

@evomotors Which firmware version are you using? If by "latest official" you mean 3.1, then the step pulse frequency for expansion boards is appallingly bad. I'm told this is fixed in 3.2 but personally, I'm waiting for that to become a stable release before I try it. The only thing that surprises me is why so few people have noticed this problem.

I guess not everyone who is using expansion and or tool boards running fast machines, or not running 1/16 micro-stepping. If I reduce to 1/8 it will be fine on printing speed of 80mm/s, but I will lose extruder accuracy, also 80mm/s is the slowest I ever print.

evomotors

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

dc42

@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.

evomotors

@dc42
Woo hoo! I will be upgrading in about an hour.

deckingman

@evomotors Just be aware that RC= Release Candidate. That's not the same as a final, stable, release. Personally, I'll continue to wait.

Phaedrux

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

@evomotors Just be aware that RC= Release Candidate. That's not the same as a final, stable, release. Personally, I'll continue to wait.

Wait no longer.

https://github.com/Duet3D/RepRapFirmware/releases/tag/3.2

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