M203 Feed Rate cannot exceed 3000 mm/min



  • Hi all

    I have now run into a problem where my motors will not spin with a feed rate over 3000 mm/min, no matter how high a value i set in M203. The speed of the movement change up to 3000 mm/min from where it just stops. If i run a G1 command with a corresponding feed rate of F15000, then there is no problems, but i cannot hardcode it in the config file.

    I there something i'm missing? My config file for the drives are as follows.

    ; 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
    M350 X16 Y16 Z16 E16 I1 ; Configure microstepping with interpolation
    M92 X55.00 Y55.00 Z5050.00 E420.00 ; Set steps per mm
    M566 X60.00 Y60.00 Z12.00 E120.00 ; Set maximum instantaneous speed changes (mm/min)
    M203 X15000.00 Y15000.00 Z1000.00 E1200.00 ; Set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z20.00 E250.00 ; Set accelerations (mm/s^2)
    M906 X3000.00 Y3000.00 Z3000.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout



  • Sounds a bit contradictory; If you can move at the desired speed with G1 Fn where is the problem?

    Are you perhaps referring to the default jog speed of either web or panel? They have their own settings not in config.g



  • @bearer I assume the problem comes when i try to use print speeds over this limit. Given the fact that slicers write the exact same Gcode as in the config file i will not be able to move my printer with more than 50mm/s, which is not fast.
    I have yet to see a slicer that writes the feed rate for each axis behind the G1 move command.



  • The duet just does as its told, within the limits of it's config.

    It is the slicers job to specify feed rates. The duet may limit it to comply with max feed/acceleration/jerk settings however.



  • Yes i know. But the problem is that i cannot seem to set this limit in my config higher than 3000 mm/min.



  • @Eplov said in M203 Feed Rate cannot exceed 3000 mm/min:

    your M566 values seem a bit low, try increasing these.



  • this is what I have set in my Config and it all works I use 0.9 degree motors on my X,Y and Z.

    It is preferable to have the M92 before the M350 and set all the steps/mm as if they where at 1/16 that way the firmware will calculate any changes in the micro stepping automatically.

    a6fbbbf4-5fd6-4d6c-835d-8080f836c591-image.png

    Hope this helps you a bit

    Your motor currents are a bit high as well they are above the maximum the firmware will allow



  • My M566 values are set that low for now, just to be sure that i don't get any vibrations throughout the structure while printing. This is also why i'm running fairly low accelerations.


  • administrators

    The speed can also be limited by M204, so send M204 without parameters to see what those limits are. The default is 10000 but some slicers put M204 commands in the GCode files they generate.



  • My M204 is default at 10000



  • What about the motor currents you set? I believe the max allowed if this is a duet 2 is 2400 yet I see your x, y and z set at 3000.

    M906 X3000.00 Y3000.00 Z3000.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent

    I wonder if that is causing an issue


  • Moderator

    @Eplov said in M203 Feed Rate cannot exceed 3000 mm/min:

    M566 X60.00 Y60.00

    1mm/s is very very low. Have you tried increasing this to see if you can get over 50mm/sprint speeds? A jerk value that low means it basically has to come to a stop at every segment.


  • Moderator

    @JamesM said in M203 Feed Rate cannot exceed 3000 mm/min:

    What about the motor currents you set? I believe the max allowed if this is a duet 2 is 2400 yet I see your x, y and z set at 3000.

    M906 X3000.00 Y3000.00 Z3000.00 E800.00 I30 ; Set motor currents (mA) and motor idle factor in per cent

    I wonder if that is causing an issue

    The Duet won't honor values above it's own max, so the motor currents delivered to the motor would be limited to 2400ma. If the motors require more that could explain low top speed.

    What are the motor specs?


  • administrators

    @Eplov said in M203 Feed Rate cannot exceed 3000 mm/min:

    I have now run into a problem where my motors will not spin with a feed rate over 3000 mm/min, no matter how high a value i set in M203.

    What is your evidence that they won't go above 3000mm/min?

    The speed of the movement change up to 3000 mm/min from where it just stops. If i run a G1 command with a corresponding feed rate of F15000, then there is no problems, but i cannot hardcode it in the config file.

    I am confused - you seem to be saying that you can get greater speeds. So under what conditions do you only get 3000mm/min?



  • If i just run a G1 X200 command i would expect the printer to move at maximum speed, but the printer does not move faster than 3000. I've looked through some GCode from Slic3R and that starts out by defining the speed within the first travel move. This means that the whole problem is more or less pointless.
    Thank you very much for everyones help.



  • @Eplov said in M203 Feed Rate cannot exceed 3000 mm/min:

    If i just run a G1 X200 command i would expect the printer to move at maximum speed

    Then you should adjust your expectations, as the printer will not comply with them.

    A G1 X200 move will move with the previously used feedrate for a G1 move.



  • In CNC mode you could use G0 X200 and it would move as fast as possible, as G0 is a rapid move; but in FFF mode G0 behaves just like G1.


  • administrators

    @bearer said in M203 Feed Rate cannot exceed 3000 mm/min:

    @Eplov said in M203 Feed Rate cannot exceed 3000 mm/min:

    If i just run a G1 X200 command i would expect the printer to move at maximum speed

    Then you should adjust your expectations, as the printer will not comply with them.

    A G1 X200 move will move with the previously used feedrate for a G1 move.

    Exactly. Note, if the machine is configured for CNC mode then G0 moves do always move at maximum speed.


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