Movement speed of the axes reduced abruptly.

[Alva]

Hello,
I have updated my machine with the newest 3.6.0-beta3 and seeing an inconsistent behaviour in the speed of the axes. The behaviour is really inconsistent. I couldnt find the pattern. Some times restarting the machine fixes the behaviour.
config(4).g . attached is the config.g . Any insights about the issue. Thank you.

[Notepad]

@Alva Looks like it might be because your jerk value on your Z axis might be too low. If you have a bed mesh, what can happen is because the bed cant keep up with the required move, it'll slow the whole machine down to keep up with the Z axis.
Currently its

M566 Z12

You may want to try something like

M556 Z160

Your accelerations also seem quite low
You may want to try

M201 Z200

[Alva]

@Notepad The values were working fine before without any problem. However i have changed the values according to your suggestion and it is behaving still the same. Was working for some minutes without any problem. The steps that i did.

1. Changed the jerk and the acceleration values as suggested above.
2. Homed the printer(It was homing in the intended speed).
3. Started the print , started moving in intended speed.
4. Canceled the print.
5. Did homing again and it started behaving weird again. Speed reduced more than half.
   When restarting the print it behaves normal for sometime.

[jay_s_uk]

@Alva can you post an M122 output please?

[Alva]

@Alva

2025-01-22 14:55:28 [debug] Diagnostics for board 121:
2025-01-22 14:55:28 [debug] Duet TOOL1LC rev 1.1 or later firmware version 3.6.0-beta.3 (2025-01-15 18:55:15)
Bootloader ID: SAMC21 bootloader version 2.4 (2021-12-10)
All averaging filters OK
2025-01-22 14:55:28 [debug] Never used RAM 8056, free system stack 100 words
Tasks: Move(3,nWait 7,0.0%,96) TMC(2,nWait 6,3.7%,52) HEAT(2,nWait 6,0.3%,96) CanAsync(5,nWait 4,0.0%,54) CanRecv(3,nWait 1,0.0%,70) CanClock(5,nWait 1,0.0%,58) ACCEL(3,nWait 6,0.0%,52) MAIN(1,running,91.2%,318) IDLE(0,ready,0.0%,26) AIN(2,delaying,4.8%,112), total 100.0%
Owned mutexes:
Last reset 00:06:42 ago, cause: power up
2025-01-22 14:55:28 [debug] Last software reset data not available
2025-01-22 14:55:28 [debug] Moves scheduled 3, hiccups 1 (0.12/0.12ms), segs 3, step errors 0 (types 0x0), maxLate 0 maxPrep 106, ebfmin 0.00 max 0.00
Peak sync jitter 0/5, peak Rx sync delay 228, resyncs 0/0, no timer interrupt scheduled, next step interrupt due in 4281978413 ticks, disabled
VIN voltage: min 23.8, current 24.0, max 24.2
MCU temperature: min 36.1C, current 41.2C, max 41.4C
2025-01-22 14:55:28 [debug] Driver 0: pos 41121, 2056.0 steps/mm, standstill, SG min 0, read errors 0, write errors 0, ifcnt 14, reads 43022, writes 1, timeouts 0, DMA errors 0, CC errors 0
2025-01-22 14:55:28 [debug] Last sensors broadcast 0x00000002 found 1 238 ticks ago, 0 ordering errs, loop time 0
CAN messages queued 6995, send timeouts 0, received 3061, lost 0, ignored 0, errs 0, boc 0, free buffers 18, min 18, error reg 0
dup 0, oos 0/0/0/0, bm 0, wbm 0, rxMotionDelay 306, adv 35865/37161
2025-01-22 14:55:28 [debug] Accelerometer: LIS3DH, status: 00
I2C bus errors 0, naks 0, contentions 0, other errors 0
2025-01-22 14:55:29 [debug] [diagnostic.g] Done /macros/printing/diagnostic.g
2025-01-22 14:55:29 [debug] [STOP] Properly closing log file
2025-01-22 14:55:29 [debug] [LOGS] Closing previous log file
2025-01-22 14:55:29 [info] Event logging stopped

[Alva]

@jay_s_uk

2025-01-22 14:55:26 [debug] === Diagnostics ===
2025-01-22 14:55:26 [debug] RepRapFirmware for Duet 3 MB6HC version 3.6.0-beta.3 (2025-01-16 19:09:36) running on Duet 3 MB6HC v1.02 or 1.02a (standalone mode)
2025-01-22 14:55:26 [debug] Board ID: 08DJM-956BA-NA3TJ-6J1FJ-3S46P-198US
2025-01-22 14:55:26 [debug] Used output buffers: 2 of 40 (35 max)
2025-01-22 14:55:26 [debug] === RTOS ===
2025-01-22 14:55:26 [debug] Static ram: 136892
2025-01-22 14:55:26 [debug] Dynamic ram: 128428 of which 0 recycled
2025-01-22 14:55:26 [debug] Never used RAM 78448, free system stack 154 words
2025-01-22 14:55:26 [debug] Tasks:
2025-01-22 14:55:26 [debug]  NETWORK(1,ready,26.4%,143)
2025-01-22 14:55:26 [debug]  ETHERNET(5,nWait 7,0.1%,318)
2025-01-22 14:55:26 [debug]  HEAT(3,nWait 6,0.0%,361)
2025-01-22 14:55:26 [debug]  Move(4,nWait 6,0.0%,215)
2025-01-22 14:55:26 [debug]  TMC(4,nWait 6,3.1%,341)
2025-01-22 14:55:26 [debug]  CanReceiv(6,nWait 1,0.0%,794)
2025-01-22 14:55:26 [debug]  CanSender(5,nWait 7,0.0%,334)
2025-01-22 14:55:26 [debug]  CanClock(7,delaying,0.0%,350)
2025-01-22 14:55:26 [debug]  MAIN(1,running,70.3%,103)
2025-01-22 14:55:26 [debug]  IDLE(0,ready,0.0%,29)
2025-01-22 14:55:26 [debug]  USBD(3,blocked,0.0%,144)
2025-01-22 14:55:26 [debug] , total 100.0%
Owned mutexes:
2025-01-22 14:55:26 [debug]  HTTP(MAIN)
2025-01-22 14:55:26 [debug] === Platform ===
2025-01-22 14:55:26 [debug] Last reset 00:06:41 ago, cause: power up
2025-01-22 14:55:26 [debug] Last software reset at 2025-01-20 15:48, reason: User, Gcodes spinning, available RAM 78764, slot 2
2025-01-22 14:55:26 [debug] Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x00400000 BFAR 0x00000000 SP 0x00000000 Task MAIN Freestk 0 n/a
2025-01-22 14:55:26 [debug] Error status: 0x00
2025-01-22 14:55:26 [debug] MCU temperature: min 49.3, current 50.2, max 50.3
2025-01-22 14:55:26 [debug] Supply voltage: min 23.7, current 24.1, max 24.3, under voltage events: 0, over voltage events: 0, power good: yes
2025-01-22 14:55:26 [debug] 12V rail voltage: min 12.1, current 12.2, max 12.5, under voltage events: 0
2025-01-22 14:55:26 [debug] Heap OK, handles allocated/used 99/6, heap memory allocated/used/recyclable 2048/1804/1708, gc cycles 0
2025-01-22 14:55:26 [debug] Events: 0 queued, 0 completed
2025-01-22 14:55:26 [debug] Date/time: 
2025-01-22 14:55:26 [debug] 2025-01-22 14:55:26
2025-01-22 14:55:26 [debug] Slowest loop: 208.16ms; fastest: 0.06ms
2025-01-22 14:55:26 [debug] USB interrupts 3
2025-01-22 14:55:26 [debug] === Storage ===
Free file entries: 17
2025-01-22 14:55:26 [debug] SD card 0 detected, interface speed: 25.0MBytes/sec
2025-01-22 14:55:26 [debug] SD card longest read time 3.3ms, write time 3.8ms, max retries 0
2025-01-22 14:55:26 [debug] === Move ===
Segments created 12, maxWait 221286ms, bed comp in use: none, height map offset 0.000, hiccups added 0/0 (0.00/0.12ms), max steps late 0, ebfmin 0.00, ebfmax 0.00
2025-01-22 14:55:26 [debug] Pos req/act/dcf: 1.00/1/-0.00 0.00/0/-0.00 2112.00/2112/0.00 0.00/0/0.00
2025-01-22 14:55:26 [debug] next step interrupt due in 273 ticks, disabled
2025-01-22 14:55:26 [debug] Driver 0: standstill, SG min 0, mspos 232, reads 41018, writes 15 timeouts 1
2025-01-22 14:55:26 [debug] Driver 1: standstill, SG min 0, mspos 408, reads 41016, writes 15 timeouts 1
2025-01-22 14:55:26 [debug] Driver 2: standstill, SG min 0, mspos 904, reads 41016, writes 15 timeouts 1
2025-01-22 14:55:26 [debug] Driver 3: standstill, SG min n/a, mspos 8, reads 41020, writes 11 timeouts 1
2025-01-22 14:55:26 [debug] Driver 4: standstill, SG min n/a, mspos 8, reads 41025, writes 11 timeouts 1
2025-01-22 14:55:26 [debug] Driver 5: standstill, SG min n/a, mspos 4, reads 41025, writes 11 timeouts 1
2025-01-22 14:55:26 [debug] Phase step loop runtime (us): min=0, max=84, frequency (Hz): min=750, max=2533
2025-01-22 14:55:26 [debug] === DDARing 0 ===
Scheduled moves 15, completed 15, LaErrors 0, Underruns [0, 0, 0]
2025-01-22 14:55:26 [debug] Segments left 0, axes/extruders owned 0x8000000f, drives owned 0x8000000f
2025-01-22 14:55:26 [debug] Code queue is empty
2025-01-22 14:55:26 [debug] === DDARing 1 ===
Scheduled moves 0, completed 0, LaErrors 0, Underruns [0, 0, 0]
2025-01-22 14:55:26 [debug] Segments left 0, axes/extruders owned 0x00000000, drives owned 0x00000000
2025-01-22 14:55:26 [debug] Code queue is empty
2025-01-22 14:55:26 [debug] === Heat ===
2025-01-22 14:55:26 [debug] Bed heaters 0 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1, chamber heaters -1 -1 -1 -1 -1 -1 -1 -1, ordering er
2025-01-22 14:55:26 [debug] Heater 0 is on, I-accum = 0.3
2025-01-22 14:55:26 [debug] Heater 1 is on, I-accum = 0.0
2025-01-22 14:55:26 [debug] === GCodes ===
2025-01-22 14:55:26 [debug] Movement locks held by HTTP, HTTP
2025-01-22 14:55:26 [debug] HTTP is ready with "M122 B{boards[iterations].canAddress}" in state(s) 0 0 24, running macro
2025-01-22 14:55:26 [debug] Telnet is idle in state(s) 0
2025-01-22 14:55:26 [debug] File is idle in state(s) 0
2025-01-22 14:55:26 [debug] USB is idle in state(s) 0
2025-01-22 14:55:26 [debug] Aux is idle in state(s) 0
2025-01-22 14:55:26 [debug] Trigger is idle in state(s) 0
2025-01-22 14:55:26 [debug] Queue is idle in state(s) 0
2025-01-22 14:55:26 [debug] LCD is idle in state(s) 0
2025-01-22 14:55:26 [debug] SBC is idle in state(s) 0
2025-01-22 14:55:26 [debug] Daemon is idle in state(s) 0
2025-01-22 14:55:26 [debug] Aux2 is idle in state(s) 0
2025-01-22 14:55:26 [debug] Autopause is idle in state(s) 0
2025-01-22 14:55:26 [debug] File2 is idle in state(s) 0
2025-01-22 14:55:26 [debug] Queue2 is idle in state(s) 0
2025-01-22 14:55:26 [debug] === CAN ===
2025-01-22 14:55:26 [debug] Messages queued 3061, received 7000, lost 0, ignored 0, errs 0, boc 0
2025-01-22 14:55:26 [debug] Longest wait 6ms for reply type 6024, peak Tx sync delay 275, free buffers 50 (min 49), ts 1650/1650/0
2025-01-22 14:55:26 [debug] Tx timeouts 0,0,0,0,0,0
2025-01-22 14:55:26 [debug] === Network ===
2025-01-22 14:55:26 [debug] Slowest loop: 187.18ms; fastest: 0.03ms
2025-01-22 14:55:26 [debug] Responder states:
2025-01-22 14:55:26 [debug]  MQTT(0)
2025-01-22 14:55:26 [debug]  HTTP(0)
2025-01-22 14:55:26 [debug]  HTTP(0)
2025-01-22 14:55:26 [debug]  HTTP(0)
2025-01-22 14:55:26 [debug]  HTTP(0)
2025-01-22 14:55:26 [debug]  HTTP(0)
2025-01-22 14:55:26 [debug]  HTTP(0)
2025-01-22 14:55:26 [debug]  FTP(0)
2025-01-22 14:55:26 [debug]  Telnet(0)
2025-01-22 14:55:26 [debug]  Telnet(0)
2025-01-22 14:55:26 [debug] HTTP sessions: 1 of 8
2025-01-22 14:55:26 [debug] = Ethernet =
Interface state: active
2025-01-22 14:55:26 [debug] Error counts: 0 0 0 0 0 0
Socket states:
2025-01-22 14:55:26 [debug]  2
2025-01-22 14:55:26 [debug]  2
2025-01-22 14:55:26 [debug]  2
2025-01-22 14:55:26 [debug]  2
2025-01-22 14:55:26 [debug]  2
2025-01-22 14:55:26 [debug]  2
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug] === WiFi ===
Interface state: disabled
Module is disabled
Failed messages: pending 0, notrdy 0, noresp 0
2025-01-22 14:55:26 [debug] Socket states:
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug]  0
2025-01-22 14:55:26 [debug] === Multicast handler ===
Responder is inactive, messages received 0, responses 0
 

[Alva]

@Alva 20250122_150146.mp4 20250122_150354.mp4
homeall.g
Attached is the two different behaviours happened. Between restarting and doing the homing.
PS: The printer is kinda test bench so please ignore the mess

[droftarts]

@Alva Please post the gcode as well, so we can check if the slicer is changing speeds/acceleration/jerk etc.

Ian

[Alva]

@droftarts CE5_gtl_ghost_redone.gcode

[Alva]

@Alva One more insight

requested speed is actually 100mm/s but it is moving in 11.8 mm/s.

[droftarts]

@Alva It looks like Cura is outputting new speeds, accelerations etc. Your config.g:

;; Axes
M584 X0.0 Y0.1 Z0.2 ; set axis mapping
M350 X16 Y16 Z16 I1 ; configure microstepping with interpolation
M906 X800 Y800 Z800 ; set axis driver currents
M92 X80 Y80 Z400 ; configure steps per mm
M208 X0:200 Y0:200 Z0:200 ; set minimum and maximum axis limits
M566 X900 Y900 Z12 ; set maximum instantaneous speed changes (mm/min)
M203 X6000 Y6000 Z180 ; set maximum speeds (mm/min)
M201 X500 Y500 Z20 ; set accelerations (mm/s^2)
;
;; Extruders
M584 E121.0 ; set extruder mapping
M350 E64 I1 ; configure microstepping with interpolation
M906 E1000  ; set extruder driver currents
M92 E2056 ; configure steps per mm
M566 E120 ; set maximum instantaneous speed changes (mm/min)
M203 E3600 ; set maximum speeds (mm/min)
M201 E250 ; set accelerations (mm/s^2)
;

Lines 19 to 22 of the gcode file:

M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration
M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate
M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration
M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk

I can't quite remember where this gets set in Cura; maybe Settings > Printer > Manage Printers ... > Machine Settings > Printer > Start G-Code. Make sure "G-Code flavor" is set to "RepRap". See https://docs.duet3d.com/en/How_to_guides/Calibration#cura

Ian

[Alva]

@droftarts oh godd!! Thank you