[BUG] Stop working when using ft_motion. Freeze at start.

[stormlyx]

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

Yes, and the problem still exists.

Bug Description

When trying to print a test ring-tower model with changeable parameters in a Prusa slicer, printing stops before it starts, and the printer can only be stopped by resetting.

Bug Timeline

New Bug?

Expected behavior

Printer can print and worked properly

Actual behavior

Fails to home when ft_motion on, and if enable ft_motion after homing in pursa slicer, then printer just stop working.

Steps to Reproduce

Prepare g-code with ringing tower, and enable ft_motion after g28, printer don't work properly
If ft_motion enabled, printer can't home.

Version of Marlin Firmware

2.1.x

Printer model

ender-3

Electronics

btt skr 1.4

LCD/Controller

mks_mini_12864

Other add-ons

No response

Bed Leveling

ABL Bilinear mesh

Your Slicer

Prusa Slicer

Host Software

SD Card (headless)

Don't forget to include

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

Additional information & file uploads

staring g-code
M493 S0
M104 S[first_layer_temperature]
M140 S[first_layer_bed_temperature]
G28
M109 S[first_layer_temperature]
M190 S[first_layer_bed_temperature]
M117 ;Purge extruder
G92 E0 ;Reset Extruder
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X10.0 Y20 Z0.2 F5000.0 ; Move to start position
G1 X10.0 Y200.0 Z0.2 F1500.0 E15 ; Draw the first line
G1 X10.4 Y200 Z0.2 F5000.0 ; Move to side a little
G1 X10.4 Y20 Z0.2 F1500.0 E30 ; Draw the second line
G92 E0 ; Reset Extruder
M493 S11 D0 ; Enable ZVD Input Shaping
archive.zip

[ellensp]

did you try the absolute latest bugfix as something very similar to this was just fixed #26595

[stormlyx]

Yes, I try it, and nothing is changed

video.mp4

[KALIKALI5]

How can I help!!

[narno2202]

@stormlyx , I try the latest bugfix following your video step by step and I can't reproduce the error.
Regarding your GCode, It is a bad idea to change the FT_MOTION mode during printing even if it works in theory (ok on my printer).

[stormlyx]

@stormlyx , I try the latest bugfix following your video step by step and I can't reproduce the error. Regarding your GCode, It is a bad idea to change the FT_MOTION mode during printing even if it works in theory (ok on my printer).

Thank you for answer. I tried again compile new bug fix 2.1.x and it work properly. I notice what standard is zv was enabled, and maybe because of it, ft_motion did't work properly.

[thisiskeithb]

I notice what standard is zv was enabled, and maybe because of it, ft_motion did't work properly.

We don't prevent Input Shaping & Fixed-time-based Motion Control from being compiled together & made available at the same time, but maybe more testing needs to be done around these.

[github-actions]

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