Extrution Feed-Rate G1 Fn not working - 6HC

Salvatore

Hello everybody,

i'm using a 6HC board and i can't control the feed rate of my extrution with F.
The speed of the stepper motor doesn't change using different feed-rate
I tried to use these commands without changes:
G1 E1 F0.1
G1 E1 F1
The maximum velocity is
M203 X1200.00 Y1200.00 Z1200.00 E1200.00
Any ideas ?

dc42

@Salvatore see the description of M203 https://docs.duet3d.com/en/User_manual/Reference/Gcodes#m203-set-maximum-feedrate in particular the I parameter.

Salvatore

@dc42 thanks for your support

I wrote this line solving partially the problem
M203 X3500.00 Y3500.00 Z3500.00 E3500.00:3500.00:3500.00 I0.01

then i tested the extruder and i got these results
G1 E1 F2 requires 30"
G1 E1 F1 requires 60"
G1 E1 F0.5 requires 100" instead of 120"
G1 E1 F0.25 requires 100" instead of 240"

I need to reduce more the feedrate reaching G1 E1 F0.025

Salvatore

@dc42
Does the firmware or the board have lower limits that do not allow stepper motors to be handled slowly?