[BUG] FT_MOTION causes violent Y movement

[vehystrix]

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

Yes, and the problem still exists.

Bug Description

When I enable FT_MOTION travel moves on the Y axis end violently, causing layer shifts.

My settings:

Send: M503
Recv: echo:; Linear Units:
Recv: echo:  G21 ; (mm)
Recv: echo:; Temperature Units:
Recv: echo:  M149 C ; Units in Celsius
Recv: echo:; Filament settings (Disabled):
Recv: echo:  M200 S0 D1.75
Recv: echo:; Steps per unit:
Recv: echo:  M92 X79.52 Y80.00 Z400.00 E424.83
Recv: echo:; Max feedrates (units/s):
Recv: echo:  M203 X500.00 Y500.00 Z10.00 E60.00
Recv: echo:; Max Acceleration (units/s2):
Recv: echo:  M201 X3000.00 Y3000.00 Z100.00 E5000.00
Recv: echo:; Acceleration (units/s2) (P<print-accel> R<retract-accel> T<travel-accel>):
Recv: echo:  M204 P500.00 R3000.00 T3000.00
Recv: echo:; Advanced (B<min_segment_time_us> S<min_feedrate> T<min_travel_feedrate> J<junc_dev>):
Recv: echo:  M205 B20000.00 S0.00 T0.00 J0.03
Recv: echo:; Home offset:
Recv: echo:  M206 X0.00 Y0.00 Z0.00
Recv: echo:; Auto Bed Leveling:
Recv: echo:  M420 S1 Z10.00 ; Leveling ON
[G29 commands removed for brevity]
Recv: echo:; Material heatup parameters:
Recv: echo:  M145 S0 H205.00 B60.00 F0
Recv: echo:  M145 S1 H240.00 B80.00 F0
Recv: echo:  M145 S2 H220.00 B70.00 F0
Recv: echo:  M145 S3 H230.00 B50.00 F0
Recv: echo:; Power-loss recovery:
Recv: echo:  M413 S0 ; OFF
Recv: echo:; Z-Probe Offset:
Recv: echo:  M851 X-28.50 Y22.00 Z-2.04 ; (mm)
Recv: echo:; Skew Factor:
Recv: echo:  M852 I0.000000 J0.000000 K0.000000 ; XY, XZ, YZ
Recv: echo:; Fixed-Time Motion:
Recv: echo:  M493 S1 A36.00 B29.50 D0 F0.00 H0.00 P1 K26.10
Recv: echo:; Nonlinear Extrusion:
Recv:   M592 A0.00 B0.00 C1.00
Recv: echo:; Input Shaping:
Recv: echo:  M593 X F0.00 D0.15
Recv: echo:  M593 Y F0.00 D0.20
Recv: echo:; Linear Advance:
Recv: echo:  M900 K0.10
Recv: echo:; Filament load/unload:
Recv: echo:  M603 L0.00 U100.00 ; (mm)
Recv: echo:; Filament runout sensor:
Recv: echo:  M412 S1 ; Sensor ON
Recv: echo:; Model predictive control:
Recv: echo:  M306 E0 P40.00 C14.54 R0.2053 A0.1187 F0.1686 H0.0056
Recv: ok

Executing the GCODE

M493 S0
G0 F21000
G0 Y50
G0 Y150

Gives this (expected) result:

MOV_0718_H.264.mp4

Executing the GCODE

M493 S1 X0 Y0
G0 F21000
G0 Y50
G0 Y150

Gives this result:

MOV_0720_H.264.mp4

I'm using the latest bugfix-2.1.x (2024/11/16)

Bug Timeline

No response

Expected behavior

Smooth movement both with FT_MOTION enabled and disabled

Actual behavior

Violent movement with FT_MOTION enabled

Steps to Reproduce

No response

Version of Marlin Firmware

bugfix-2.1.x 2024/11/16

Printer model

Neptune 3 Plus

Electronics

stock

LCD/Controller

stock elegoo LCD

Other add-ons

No response

Bed Leveling

ABL Bilinear mesh

Your Slicer

None

Host Software

OctoPrint

Don't forget to include

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

Additional information & file uploads

Configuration.zip

Send: M115
Recv: echo:M115
Recv: FIRMWARE_NAME:Marlin bugfix-2.1.x (Nov 18 2024 14:24:38) SOURCE_CODE_URL:github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:3D Printer KINEMATICS:Cartesian EXTRUDER_COUNT:1 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff
Recv: Cap:SERIAL_XON_XOFF:0
Recv: Cap:BINARY_FILE_TRANSFER:0
Recv: Cap:EEPROM:1
Recv: Cap:VOLUMETRIC:1
Recv: Cap:AUTOREPORT_POS:0
Recv: Cap:AUTOREPORT_TEMP:1
Recv: Cap:PROGRESS:0
Recv: Cap:PRINT_JOB:1
Recv: Cap:AUTOLEVEL:1
Recv: Cap:RUNOUT:1
Recv: Cap:Z_PROBE:1
Recv: Cap:LEVELING_DATA:1
Recv: Cap:BUILD_PERCENT:1
Recv: Cap:SOFTWARE_POWER:0
Recv: Cap:TOGGLE_LIGHTS:1
Recv: Cap:CASE_LIGHT_BRIGHTNESS:1
Recv: Cap:EMERGENCY_PARSER:1
Recv: Cap:HOST_ACTION_COMMANDS:1
Recv: Cap:PROMPT_SUPPORT:1
Recv: Cap:SDCARD:1
Recv: Cap:MULTI_VOLUME:0
Recv: Cap:REPEAT:0
Recv: Cap:SD_WRITE:1
Recv: Cap:AUTOREPORT_SD_STATUS:0
Recv: Cap:LONG_FILENAME:1
Recv: Cap:LFN_WRITE:1
Recv: Cap:CUSTOM_FIRMWARE_UPLOAD:0
Recv: Cap:EXTENDED_M20:1
Recv: Cap:THERMAL_PROTECTION:1
Recv: Cap:MOTION_MODES:0
Recv: Cap:ARCS:1
Recv: Cap:BABYSTEPPING:1
Recv: Cap:EP_BABYSTEP:0
Recv: Cap:CHAMBER_TEMPERATURE:0
Recv: Cap:COOLER_TEMPERATURE:0
Recv: Cap:MEATPACK:0
Recv: Cap:CONFIG_EXPORT:0

[rondlh]

FT Motion is in beta, some issues are to be expected.
For me it also doesn't work. Even a basic line move doesn't work correctly.
If I make a move (200, 100) --> (0, 0) the Y-position (0) is reached before the X-position(0). So it's not a straight line, it's like a "J". My X-steps/mm is 160, Y-steps/mm is 100.