Input Shaping

Input Shaping

From the Klipper Documents

“Klipper Input Shaping improves print quality by exorcising the ghosts caused by vibrations and resonances. Read on to learn all about it!”

Klipper: Input Shaping – Simply Explained

Basic tuning requires measuring the ringing frequencies of the printer by printing a test model.

According to the Klipper docs, slice the ringing test model, which can be found in docs/prints/ringing_tower.stl, in the slicer:

• Use a layer height is 0.2 or 0.25 mm.
• Both the infill and top layers can be set to 0.
• Use eithet 1-2 perimeters, or vase mode with 1-2 mm base.
• Use a high speed that is around 80-100 mm/sec, for external perimeters.
• aThe minimum layer time is at most 3 seconds.
• Turn off any “dynamic acceleration control” controls in the slicer.
• Do not turn the model. It has X and Y marks at the back of the model. Note the unusual location of the marks vs. the axes of the printer - it is not a mistake. The marks can be used later in the tuning process as a reference, because they show which axis the measurements correspond to.

Steps

1. If square_corner_velocity parameter was changed, revert it back to 5.0.
2. Klipper Console Command:

SET_VELOCITY_LIMIT ACCEL_TO_DECEL=7000

3. Klipper Console Command:

SET_PRESSURE_ADVANCE ADVANCE=0

4. Klipper Console Command:

SET_INPUT_SHAPER SHAPER_FREQ_X=0 SHAPER_FREQ_Y=0

5. Klipper Console Command:

TUNING_TOWER COMMAND=SET_VELOCITY_LIMIT PARAMETER=ACCEL START=1500 STEP_DELTA=500 STEP_HEIGHT=5

6. Print with Settings Above
7. Count the “rings” on X and Y sides of ringing tower
8. Measure the distance between Rings

Input Shaping Calculator

Edit Printer.cfg

Add Below to Printer.cfg with above X and Y Frequencies

[input_shaper]
shaper_freq_x: <X Frequency>  # frequency for the X mark of the test model
shaper_freq_y: <Y Frequency>  # frequency for the Y mark of the test model

Then Run the following Steps in the Klipper Console:

1. Klipper Console Command:

RESTART

2. Klipper Console Command:

SET_VELOCITY_LIMIT ACCEL_TO_DECEL=7000

3. Klipper Console Command:

SET_PRESSURE_ADVANCE ADVANCE=0

4. Klipper Console Command:

SET_INPUT_SHAPER SHAPER_TYPE=MZV

5. Klipper Console Command:

TUNING_TOWER COMMAND=SET_VELOCITY_LIMIT PARAMETER=ACCEL START=1500 STEP_DELTA=500 STEP_HEIGHT=5

6. Print the Model as above

If you see no rings add the following to the [input_shaper] section

[input_shaper]
shaper_freq_x: <X Frequency>  # frequency for the X mark of the test model
shaper_freq_y: <Y Frequency>  # frequency for the Y mark of the test model
shaper_type: mzv

** Video Coming Soon **