[BUG] Linear Advance K Calibration Print stops extruding

[stantond]

Bug Description

Using Marlin 1.1.9-bugfix on an Ender 3 Pro with Creality 1.1.5 board.
Created GCODE for calibrating Linear Advance 1.5 using http://marlinfw.org/tools/lin_advance/k-factor.html
The first test line prints, then the extruder stops.

==========The following text is additional information the Marlin Team did not want to get lost ==============

When using StealthChop, the motion should not start with a high frequency,
but the stepper motor has to accelerate softly. A high frequency start and
subsequent stop will lead to:

1. Current regulated up to a high value, as a high back EMF is anticipated.

2. When stopping the motor again (no further pulses) the high current is kept
   for some time. This can lead to motor overcurrent and the dnver thus disabling.

To solve:
Accelerate the motor slowly. The first and last step pulses of a motion
therefore have to have a higher distance.

The TMC drivers have a step filter (per default enabled by GCONF.8) to cope
with uneven step pulses occurring as bursts of 2-4 steps generated by
software pulse generators, but the filter needs roughly 32 microsteps to
(fully) adapt to the initial velocity of a ramp.

Follow up questions:

Q: Would it be right to think that the motor supply voltage, motor coil
resistance and motor coil inductance will all affect whether the overcurrent
condition occurs?

A: Yes.

Q: How do VREF and IHOLD_IRUN affect things? e.g. will a lower current setpoint
make it more likely that the over-current condition will be triggered?

A: A higher current setting (as controlled by IRUN and VREF) will make it
more likely to trigger overcurrent detection in case of the fast step pulses.

Q: What register/flag could we read from the UART to find out whether this
overcurrent condition has occurred? e.g. would it be something like the
s2vsa, s2vsb, s2ga or s2gb flags in DRV_STATUS?

A: Correct, a short condition will be signalled in DRV_STATUS and in GSTAT.

My Configurations

Required: Please include a ZIP file containing your Configuration.h and Configuration_adv.h files.

Linear Advance 0 to 2 kfactor.txt .gcode

Configuration.txt .h

Configuration_adv.txt .h

Steps to Reproduce

1. Generate GCODE using the online tool
2. Print it
3. Watch the extruder

Expected behavior: [What you expect to happen]

The extruder extrudes and the full print prints.

Actual behavior: [What actually happens]

The first test line (K=0) prints.
The plastic thins out over the next two lines to nothing, and the extruder stops turning entirely.

• Provide pictures or links to videos that clearly demonstrate the issue.

[Grogyan]

Please try Marlin 2.0

[shitcreek]

Marlin 1.1.9 is no longer actively worked on. Please try 2.0.

I don't see anything that stands out in your config and gcode files. Has the bed been leveled? How exactly does it stop? Like does it continue to try and complete the job except with zero extrusion or does it end the job after the 3rd line? Have you tried doing 0.1 K factor stepping and see if it will produce more lines? Try enabling LA_DEBUG and check the outputs.

[stantond]

The bed is pretty level as it is, but there's also a G29 in the print GCODE.

It continues and completes the print job, but it stops extruding and doesn't continue. The photo shows a "finished" print.

I can try 0.1 stepping tomorrow, although I suspect it stops as soon as K >0.

How do I use LA_DEBUG? I usually use with Octoprint.

[shitcreek]

I haven't used Octoprint so I don't know with that. You need to connect to the machine via USB. You could use repetier, adruino ide or whathaveyou. LA_DEBUG must be enabled in your configuration first and your machine reflashed - you might as well upgrade to 2.0 :D

[boelle]

@stantond did you try 2.0.x ?

[Strahler85]

Could it be, that the 1.1.5 creality board is the silent board with the tmc 2208 on all axis in standalone and stealthchop mode?
As far as a I know, LA does not work with tmc 2208 standalone at Extruder Motor in stealthchop Mode.

[thisiskeithb]

How do I use LA_DEBUG? I usually use with Octoprint.

There's a terminal tab in OctoPrint which is where you'll watch/send commands:

[boelle]

closing this one until we hear back from @stantond

as said above 1.1.9 is no longer active worked on, please use 2.0.x

[stantond]

As far as a I know, LA does not work with tmc 2208 standalone at Extruder Motor in stealthchop Mode.

@Strahler85 I'm using the Creality 1.1.5 board, and I believe it does use 2208 drivers in stealthchop mode for all motors. Do you know of there's a way to change the mode for the E driver?

@boelle of the above is true, this issue will affect any version of Marlin using this board

[shitcreek]

In 2.0, you can disable stealthchop for each stepper in configuration_adv.h ie #define STEALTHCHOP_E

[boelle]

i cant reproduce and i think the difference is that i dont use stealthchop on the extruder

https://github.com/boelle/Marlin/tree/Mendel90

i use drv8825 for the extruder and that is why i know, for everything else i use tmc2100

will close this one as it most likely a config issue and not a bug as such