@engikeneer said in external drive a4988 duet no work:

@dpsslaser2020 said in external drive a4988 duet no work:

M563 P0 D0:1 H1 F0 ; define tool 0
M563 P1 D0:2 H1 F0 ; define tool 1
M567 P5 E3:5

Here you have assigned two tools. One uses extruders 0 & 1 (okay), the other tool uses extruder 1 & 2 (which doesn't exist).

In your M567 you have assigned a mixing ratio of 3:5 on tool 5 (which doesn't exist!).

You want:

M563 P0 D0:1 H1 F0 ; define tool 0 using extruder 0 and 1 M567 P0 E1:1 ; assign 1:1 mixing ratio to tool 0

It starts in a proven basic mix mode with the control E axis and both motors move in sync!
Thank you!
Have a nice day!