Thanks @gloomyandy, I misunderstood. Changing it to:

M350 Z16 I1
M92 Z400
M906 Z300
M569 D3 P0.2 V20
G1 F60
G28 Z
G1 Z10 F60
G1 Z0 F60

made it silent. Thank you so much!

Currently, when a point is probed, the head must move in X to the point, probe all the way down to the bed, then raise all the way back up, when it will move in X to the next point. This could be optimized by moving in X while simultaneously raising the head. I don't see an option to perform this using G29. I believe this modification could reduce probe times by quite a bit.

Sorry, I should have mentioned that that diagram is viewed from the X-Z plane. Eg left/right is X and up/down is Z.

I don't quite understand your edit @Phaedrux. If you were using a probe such as a switch or piezo sensor, you would be dragging the sensor across the bed. The diagonals that I had included would allow the sensor to clear the triggered state by still utilizing the dive height. This is important when it comes to highly warped beds, or for any sensor that requires contact with the bed.

Edit: Oh, I think your suggestion may work for analog non-contact probes and beds with a low amount of warp, but it would fail for anything else.

@dc42 said in [Coming soon: Accelerometer Support]

Yes, use the temp daughterboard connector to connect an accelerometer directly. The SBC uses a separate SPI bus. However, currently accelerometer data can only be saved to file when running in standalone mode.

Will this still work if you have a temperature daughterboard installed? I'm utilizing the thermocouple board on a Mini 5+.

@jay_s_uk That worked great! Will this affect the torque curve? How did I know if this value is too low/too high? I guess by looking at the steps/mm output when you run M569 Px?

Sorry, I should have mentioned that that diagram is viewed from the X-Z plane. Eg left/right is X and up/down is Z.

I don't quite understand your edit @Phaedrux. If you were using a probe such as a switch or piezo sensor, you would be dragging the sensor across the bed. The diagonals that I had included would allow the sensor to clear the triggered state by still utilizing the dive height. This is important when it comes to highly warped beds, or for any sensor that requires contact with the bed.

Edit: Oh, I think your suggestion may work for analog non-contact probes and beds with a low amount of warp, but it would fail for anything else.

Sorry, I included the incorrect config. Here's what's on my board:

M569 P0.0 S1                                ; physical drive 0.0 goes forwards
M569 P0.1 S1                                ; physical drive 0.1 goes forwards
M569 P0.2 S1                                ; physical drive 0.2 goes forwards
M569 P0.3 S1                                ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E0.3                    ; set drive mapping
M350 X16 Y16 Z16 E16 I1                     ; configure microstepping with interpolation
M92 X88.87 Y88.87 Z400.00 E400.00           ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00         ; set maximum instantaneous speed changes (mm/min)
M203 X12000.00 Y12000.00 Z720.00 E1200.00     ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z50.00 E250.00         ; set accelerations (mm/s^2)
M906 X800 Y800 Z320 E800 I30                ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                     ; Set idle timeout

Hiccups for both MainDDARing and AuxDDARing are 0.

Hi everyone,

I've recently upgraded my Duet Maestro to a Mini 5+ after the ethernet controller died. One thing that I haven't been able to figure out is that the extruder motor now makes a strange whirring noise when extruding. This didn't happen on the Maestro, and I suspect it's caused by the change in stepper drivers between the two models.

Video: https://www.dropbox.com/s/xkfhbbf8rjpr45w/extruder_whirring.mov?dl=0

I've tried switching it into spread cycle mode, however the idle noise was driving me crazy, so I switched it back. I assume this is something to do with the driver switching between spreadcycle and stealthchop? The X and Y motors are the same model, and they don't seem to have the issue, so it seems like it arrises when running at a low step rate.

My config is straight-forward:

M569 P0.0 S1                                ; physical drive 0.0 goes forwards
M569 P0.1 S1                                ; physical drive 0.1 goes forwards
M569 P0.2 S1                                ; physical drive 0.2 goes forwards
M569 P0.3 S1                                ; physical drive 0.3 goes forwards
M584 X0.0 Y0.1 Z0.2 E0.3                    ; set drive mapping
M350 X128 Y128 E64 I0                       ; configure microstepping without interpolation
M350 Z16 I1                                 ; configure microstepping with interpolation
M92 X711.00 Y711.00 Z400.00 E400.00         ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00         ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z360.00 E1200.00     ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z50.00 E250.00         ; set accelerations (mm/s^2)
M906 X800 Y800 Z320 E800 I30                ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                     ; Set idle timeout

The video shows a 50mm extrusion at 5mm/s.

Motor specs:
Voltage: 4.96V
Current: 0.8A
Resistance: 6.2 ohms
Inductance: 10mH
Torque: 2.4 Kg*cm

I'm running on a 24V supply.

Has anyone run into this before?

Currently, when a point is probed, the head must move in X to the point, probe all the way down to the bed, then raise all the way back up, when it will move in X to the next point. This could be optimized by moving in X while simultaneously raising the head. I don't see an option to perform this using G29. I believe this modification could reduce probe times by quite a bit.

Thanks @gloomyandy, I misunderstood. Changing it to:

M350 Z16 I1
M92 Z400
M906 Z300
M569 D3 P0.2 V20
G1 F60
G28 Z
G1 Z10 F60
G1 Z0 F60

made it silent. Thank you so much!

@o_lampe
The lead screw is oiled, and it still makes the noise when the bed has been removed. The lead screw is straight.

Setting the motor current to 300mA made no difference.

I changed my test gcode to include your change. No difference.

I changed the max requested speed in the EMF calculator to what I actually set (60mm/s) and the results are better, however in practice, it's still quite loud.

Approximate peak back EMF due to rotation per motor: 3.9 V at 60.0 mm/s
Approximate peak back EMF due to inductance per motor: 6.4 V at 60.0 mm/s
Step pulse frequency: 4.8 kHz at 60.0 mm/s
Speed at which torque starts to drop (low slip angle): 121.6 mm/s @ 9.7 kHz
Speed at which torque starts to drop (high slip angle): 163.2 mm/s @ 13.1 kHz

@gloomyandy Unfortunately setting the driver to spread cycle didn't make a difference either.

I'll put in an order for another motor. Fingers crossed!

I should also mention that I am running the printer on 24V.

According to the EMF calculator for 800mA, it says:

Approximate peak back EMF due to rotation per motor: 6.5 V at 200.0 mm/s
Approximate peak back EMF due to inductance per motor: 56.5 V at 200.0 mm/s
Step pulse frequency: 16.0 kHz at 200.0 mm/s
Speed at which torque starts to drop (low slip angle): n/a
Speed at which torque starts to drop (high slip angle): n/a

For 400mA:

Approximate peak back EMF due to rotation per motor: 6.5 V at 200.0 mm/s
Approximate peak back EMF due to inductance per motor: 28.3 V at 200.0 mm/s
Step pulse frequency: 16.0 kHz at 200.0 mm/s
Speed at which torque starts to drop (low slip angle): 106.7 mm/s @ 8.5 kHz
Speed at which torque starts to drop (high slip angle): 126.5 mm/s @ 10.1 kHz

The back EMF due to inductance is very high. Is this the cause?

Hi everyone. I've been experiencing some issues with my Z axis motor. It is a 42HB34F04ASG-09 from Bohong. The specs are:

Step angle: 1.8
Rated voltage: 13.2
Current: 0.4A/phase
Resistance: 33 ohms/phase
Inductance: 45 mH/phase
Holding torque: 2.4 kg/cm

The integrated lead screw is TR8 with 4 starts, 300mm.

I am using a Duet 3 Mini. My config.g is:

; General preferences
G90                                         ; send absolute coordinates...
M83                                         ; ...but relative extruder moves

; Network
M552 P0.0.0.0 S1                            ; enable network and acquire dynamic address via DHCP
M586 P0 S1                                  ; enable HTTP
M586 P1 S0                                  ; disable FTP
M586 P2 S0                                  ; disable Telnet

; Drives
M569 P0 S1                                  ; physical drive 0 goes forwards
M569 P1 S1                                  ; physical drive 1 goes forwards
M569 P2 S1                                  ; physical drive 2 goes forwards
M569 P3 S1                                  ; physical drive 3 goes forwards
M584 X0 Y1 Z2 E3                            ; set drive mapping
M350 X128 Y128 E64 I0                       ; configure microstepping without interpolation
M350 Z16 I1                                 ; configure microstepping with interpolation
M92 X711.00 Y711.00 Z400.00 E582.00         ; set steps per mm
M566 X900.00 Y900.00 Z12.00 E120.00         ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z360.00 E1200.00     ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z50.00 E250.00         ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30                ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                     ; Set idle timeout

; Axis Limits
M208 X-45 Y0 Z0 S1                          ; set axis minima
M208 X230 Y150 Z150 S0                      ; set axis maxima

; Endstops
M574 X2 S1 P"!xstop"                        ; configure active-high endstop for high end on X via pin !xstop
M574 Y2 S1 P"!ystop"                        ; configure active-high endstop for high end on Y via pin !ystop
M574 Z1 S1 P"!zstop"                        ; configure active-high endstop for low end on Z via pin !zstop

; Z-Probe
M558 P0 H-5 F120 T6000                      ; disable Z probe but set dive height, probe speed and travel speed
M557 X-30:215 Y15:125 S20                   ; define mesh grid

; Heaters
M140 H-1                                    ; disable heated bed (overrides default heater mapping)
M308 S0 P"spi.cs1" Y"thermocouple-max31856" ; configure sensor 0 as thermocouple via CS pin spi.cs1
M950 H0 C"e0heat" T0                        ; create nozzle heater output on e0heat and map it to sensor 0
M307 H0 B0 S1.00                            ; disable bang-bang mode for heater  and set PWM limit

; Fans
M950 F0 C"fan0" Q500                        ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H0 T45                           ; set fan 0 value. Thermostatic control is turned on
M950 F1 C"fan1" Q500                        ; create fan 1 on pin fan1 and set its frequency
M106 P1 S0 H-1                              ; set fan 1 value. Thermostatic control is turned off

; Tools
M563 P0 D0 H0 F0:1                          ; 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

; Custom settings
M671 X65:165:116 Y10:10:150                 ; set positions of bed levelling screws

; Miscellaneous
T0                                          ; select first tool

As can be seen, I have set the Z axis stepper current to 400mA, with x16 micro-stepping with interpolation. With these settings, I am getting a lot of noise:

https://www.dropbox.com/s/k89gnkdi3inhgwb/16_interp_400mA.mov?dl=0

This is using the following gcode:

M350 Z16 I1
M92 Z400
M906 Z400
G28 Z
G1Z10
G1Z0

I installed a stepper damper between the motor and the chassis hoping that it would reduce the noise, however it didn't make any difference.

I have tried every micro-stepping setting (interpolated and not) and its compensated steps/mm, and it didn't make any difference with the noise. The only thing that made a difference was increasing the current.

This is with 800mA:

https://www.dropbox.com/s/iqo8btcrsayl4ys/16_interp_800mA.mov?dl=0

It removes the high frequency, but it is still very loud.

Has anyone run into a problem such as this before? How can I reduce the noise?

Thanks!