Low torque extruder

[T3P3Tony]

@chownki how is the low torque presenting itself (e.g. is the extruder skipping steps?) you ar eusing a value if 650mA for your extruder motor which is reasonable for many smaller stepper motors on extruder but its not possible without know the motor model to say if this is corrrect.

[Chownki]

@t3p3tony Yep its skipping steps. looks to me like its not the getting the right amount of current..
I got a bondtech prusa i3 mk3 extruder
STEPPER MOTOR
Lightweight 25 mm pancake stepper with 18 N/m torque.
Max Input Current : 0.8A
Max chamber working temperature : 80℃

[o_lampe]

@chownki You can try 0.8A, but keep an eye on the stepper temperature.
These pancake steppers with geared extruders are sensitive to idler pressure . When you clamp the filament too much, the stepper looses a lot of it's energy to deform the filament.
There is also the chance you have a partially clogged nozzle.

[Chownki]

@o_lampe Have tried upping the amps but no difference - have checked the nozzle and tried replacing, can manuel push the filament through the nozzle with little to no force, when gears are not engaged.
Im sure its not a hardware problem, but some where its not loading the config.g right on start up - when i do M98 pconfig.g all problems are gone

[o_lampe]

@chownki said in Low torque extruder:

; Motor remapping for dual Z and axis Limits
M584 X0 Y1 Z2:4 E3 ; two Z motors connected to driver outputs Z and E1

This motor mapping should come before the other motor settings (microstepping, accel, jerk, etc.)

[T3P3Tony]

@chownki said in Low torque extruder:

but some where its not loading the config.g right on start up - when i do M98 pconfig.g all problems are gone

Before you do the config.g reload does the mtor move at all? I would make the change that @o_lampe mentions.

[engikeneer]

@chownki also, if you send the commands ( e.g. M906) with no parameters via the console in DWC, it will report back what settings are currently applied so you can see what's going on

[Gixxerfast]

@chownki said in Low torque extruder:

M308 S1 P"e0_temp" Y"PT1000" T100000 B4725 R4700 ; Set thermistor + ADC parameters for heater 1 HotEnd

This makes no sense to me. The type is PT1000 and then you have thermistor values.

I guess you don't have a pt1000 and therefore should have Y"thermistor"

Correct?

Here's my config before and after switching to a pt1000:

;M308 S1 P"121.temp0" Y"thermistor" T100000 B4267 ; configure sensor 1 as thermistor on pin 121.temp0
M308 S1 P"121.temp0" Y"pt1000"                   ; configure sensor 1 as pt1000 on pin 121.temp0

[Chownki]

@o_lampe Thats all i needed - Thanks!

[Chownki]

@t3p3tony Yep all other steppers moved fine - did what @o_lampe told and now problem is gone

[Chownki]

@gixxerfast Looks like i had a brain fart! got a pt1000 so just stole your config - old one worked tho

[T3P3Tony]

@chownki thanks for confirming that!