@dc42 @bot both suggestions were right. The movement timing is predictable now . Thank you!.

@bot "two moves of a print movement" means two axis have to move or two movement commands of a single axis would do?. Thanks in advance.

@bot I will try this also and update. Thank you for the reply.

@dc42 I will try this and update . Thanks for the reply

@dc42 Hello, I think i need some more help. The system we are designing has a single axis movement setup which moves 70mm . I have changed the steps per mm setup to allow for the slow speeds we require.

The translation stage is however supposed to move at relatively higher speeds (eg. 100mm/min). We need the translation stage to reach the speed with the highest acceleration possible. I have set the acceleration and other settings to reflect the change in steps per mm , however the stage always accelerates when starting a move and decelerates when stopping.

This is affecting our timing. Is there a limit to max instantaneous speed change?.

My config file

; General preferences
G90                                   ; send absolute coordinates...
M83                                   ; ...but relative extruder moves
M550 P"PICO"                          ; set printer name

; Network
M552 S1 P192.168.1.2                  ; enable network and acquire dynamic address via DHCP
M586 P0 S1                            ; enable HTTP
M586 P1 S1                            ; 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  
M569 P3 S1 
M569 P4 S1                            ; physical drive 4 goes forwards
M584 X0 Y1 Z2 U3 V4                   ; set drive mapping
M350 X256 Y256 Z256 U256 V256 I0      ; configure microstepping without interpolation
M92 X102.4 Y512 Z512 U102.4 V512              ; set steps per mm
M566 X1000000.00 Y1000000.00 Z1000000.00 U1000000.00 V1000000.00    ; set maximum instantaneous speed changes (mm/min)
M203 X1000000 Y1000000 Z1000000 U1000000 V1000000 I0.0001	; set maximum speeds (mm/min) 
M201 X1000000.00 Y1000000.00 Z1000000.00 U1000000.00 V1000000.00         ; set accelerations (mm/s^2)
M906 X1000 Y1000 Z1000 U1000 V1000 I30            ; set motor currents (mA) and motor idle factor in per cent
M84 S30                               ; Set idle timeout

; Axis Limits
M208 X0 Y0 Z0 U0 V0 S1                      ; set axis minima
M208 X70 Y80 Z80 U80 V300 S0                   ; set axis maxima

; Endstops
M574 X1 Y1 Z1 U1 V1 S0                      ; set active low and disabled endstops

; Z-Probe
M558 P0 H5 F120 T6000                 ; disable Z probe but set dive height, probe speed and travel speed
M557 X0:70 Y0:80 S20                  ; define mesh grid

; Heaters
M140 H-1                              ; disable heated bed

; Fans

; Tools

; Custom settings are not defined

@dc42 sure, we are developing an electro spinning machine which requires very low material to be dispensed. We use a syringe to hold the material that is to be dispensed and the lowest dispensing rate is about 0.05ml/hour. Hence the low speed requirement. We are using duet because we also need 3 axis movement of the syringe.

@dc42 Hello, your solution works. Thank you!

@dc42 Thank you for the quick reply. I will try out your recommendation.

@dc42 Im using the duet on a project that requires extremely low speeds. For example I need to move 0.00005mm in 60 seconds. I have set lower speeds with M203 as mentioned in the documentation, however the move is completed in half the time. I have tried the same setup for longer distances and it works fine. Basically i need the movement to complete exactly at set times. Thank you for any input.

Big fan of Duet products.

@droftarts The solution mentioned in the guide didn't exactly work for me. I had to go to
"Update Drive Software -> Browse Computer for Software ->List of Device driver on my Computer -> Ports (COM & LPT) -> (manufacturer) Escher3D -> Alligator 3D Printer Control electronics".

@droftarts yes, my bad.