Extruder always in spread cycle mode (mini 5+)

Simon 4

Thomas Sanladerer posted a 2nd test with the revo roto
https://www.youtube.com/watch?v=GjwPWPhLR8M&t=1s
and found out that it works better in spread
cycle mode.

my question is, how do I set the extruder to only spread cycle mode?

In the dokumentation configuring spread cycle is missing at the moment
https://docs.duet3d.com/en/User_manual/Connecting_hardware/Motors_tuning
and in the configuring stealth chop I can set the points whrere the system jumps
between both. But if I want no stealth at all, on the extruder ?

droftarts

@Simon-4 To permanently set spreadcycle, change the M569 command for that motor to include the D parameter, set to 2. eg:

M569 P0.4 S1 D2

spreadCycle is actually the default, so probably you have D3 with a V parameter. If you set the V parameter very high, eg V25000, you can set the changeover to a very low speed. This means that the motor will at least be quiet at standstill. Send M569 P#, where # is the stepper driver number, to see the current setting and the speed the changeover happens, e.g.:

M569 P121.0 S0 D3 V2000
M569 P121.0
Driver 121.0 runs in reverse, active low enable, mode stealthChop, ccr 0x00053, toff 3, tblank 0, tpwmthrs 2000 (0.9 mm/sec), pwmScaleSum 16, pwmScaleAuto 0, pwmOfsAuto 36, pwmGradAuto 14, pos 8
M569 P121.0 V25000
M569 P121.0
Driver 121.0 runs in reverse, active low enable, mode stealthChop, ccr 0x00053, toff 3, tblank 0, tpwmthrs 25000 (0.1 mm/sec), pwmScaleSum 16, pwmScaleAuto 0, pwmOfsAuto 36, pwmGradAuto 14, pos 8
M569 P121.0 D2
M569 P121.0
Driver 121.0 runs in reverse, active low enable, mode spreadCycle, ccr 0x00053, toff 3, tblank 0, hstart/hend/hdec 5/0/0, pos 8

See https://docs.duet3d.com/en/User_manual/Reference/Gcodes#m569-set-motor-driver-direction-enable-polarity-mode-and-step-pulse-timing

Ian