[BUG] SWITCHING_EXTRUDER Servo movement fails

[jesterhead82]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

Toolchange (either by Tx, or by using LCD Menu entry in MOTION section), does not trigger servo movement.

Setup

• Single Nozzle, 2 Extruder setting using shared E0
• Servo to Switch Extruder gears

Manual movement of Servo (e.g. M280 P1 S5) works as expected, Extruder direction changes also with Toolchange.

As a workaround I added manual Servo movement to EVENT_GCODE_TOOLCHANGE_T0 / EVENT_GCODE_TOOLCHANGE_T1

Bug Timeline

No response

Expected behavior

Servo Moves to T0 after start of printer and switches during T0/T1 change

Actual behavior

No movement triggered by Toolchange, no init of Position (servo is powerless) after startup

Steps to Reproduce

No response

Version of Marlin Firmware

Bugfix 2.1.x as of this week

Printer model

No response

Electronics

No response

Add-ons

No response

Bed Leveling

No response

Your Slicer

No response

Host Software

No response

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.

Additional information & file uploads

Config.zip

[ellensp]

Provided config does not compile .. to many recent changes to bugfix config files

Updated configs updated.zip

For me:
Servo does move on T0 and T1 but not as expected.
I increased SWITCHING_EXTRUDER_SERVO_ANGLES { 25, 8 } to {90 and 170} to make it much more obvious
Servo does not initialize to T0 position on startup

[ellensp]

weird this movement to position 8 ish is not coming from anywhere obvious...
At the moment I have it so that T0 or t1 moves correctly, but then something I cannot locate moves back to the weird location

[ellensp]

gah you have
#define EVENT_GCODE_TOOLCHANGE_T0 "M280 P1 S25" // Extra G-code to run while executing tool-change command T0
#define EVENT_GCODE_TOOLCHANGE_T1 "M280 P1 S6" // Extra G-code to run while executing tool-change command T1

[jesterhead82]

Hi,

I'm working on a switching extruder where I use a Toothed Rack to press L/R idler against the driveshaft, therefor I only need some degrees of movement on the servo.

As for Event_GCode, i'm misusing that that as a workaround, behaviour was the same for me without it.

[ellensp]

in Marlin/src/module/tool_change.cpp
Find
if ((EXTRUDERS & 1) && e < EXTRUDERS - 1) {
replace it with:
if (e < EXTRUDERS) {

This works as expected, but im still working out why it was as it was....

And disable EVENT_GCODE_TOOLCHANGE 's

[jesterhead82]

Will test, but will take 2 weeks.

Btw could be because of a 2x2 Setup (nozzle and extruder switch, there's an BR for that setup where some stuff has been modified)

[ellensp]

A PR has been created to fix this.

[jesterhead82]

I want only to confirm that the srvo is working now, thanks.

[github-actions]

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