K-Profiles (Pressure Advance)

Manage pressure advance settings directly on your printers for improved print quality.

What Are K-Profiles?

K-profiles store pressure advance (also called Linear Advance) settings:

• Compensate for filament compression in the extruder
• Reduce corner bulging and improve sharp edges
• Different values needed for different filaments and speeds

K-Value Basics

Material	Typical K-Value Range
PLA	0.01 - 0.06
PETG	0.02 - 0.10
ABS	0.02 - 0.08
TPU	0.10 - 0.30

Lower values = less compensation. Higher values = more compensation.

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Accessing K-Profiles

1. Go to Settings > K-Profiles
2. Select a connected printer from the dropdown
3. Choose a nozzle size (0.2, 0.4, 0.6, 0.8mm)
4. Profiles are loaded from the printer

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Viewing Profiles

Profile Cards

Each profile displays:

• K-Value: The pressure advance factor
• Profile Name: Usually the filament name
• Filament ID: Material identifier
• Flow Type: HF (High Flow) or S (Standard)

Filtering Options

• Search: Filter by profile name or filament ID
• Nozzle Size: 0.2, 0.4, 0.6, 0.8mm
• Flow Type: All, HF Only, or S Only
• Extruder: All, Left Only, or Right Only (dual-nozzle)

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Dual-Nozzle Printers (H2 Series)

For H2D, H2C, and H2S printers with dual nozzles:

Automatic Detection

Bambuddy detects nozzle count from MQTT temperature data:

• Single nozzle: Standard interface
• Dual nozzle: Left/Right column layout

Column Layout

Profiles are organized by extruder:

• Left Column: Left extruder profiles
• Right Column: Right extruder profiles

Extruder Filter

Show profiles for one extruder only:

• All (default)
• Left Only
• Right Only

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Editing K-Profiles

1. Click on any profile card
2. Edit modal opens with current values
3. Modify the K-value
4. Click Save
5. Profile is updated on the printer

K-Value Guidelines

• Start with recommended values for your material
• Increase if you see corner bulging
• Decrease if you see gaps at corners
• Small changes (0.01-0.02) make noticeable differences

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Adding K-Profiles

1. Click Add Profile in the header
2. Select a filament from the dropdown
3. Choose flow type (High Flow or Standard)
4. Choose nozzle size
5. For dual-nozzle: Select Left or Right extruder
6. Enter the K-value
7. Click Save

Filament Selection

The filament dropdown shows:

• Filaments already calibrated on the printer
• Materials from existing K-profiles

Note

: New filaments must first be calibrated in Bambu Studio before they appear in this dropdown.

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Deleting K-Profiles

1. Click on the profile card
2. Click the trash icon
3. Confirm deletion
4. Profile is removed from the printer

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Calibrating K-Values

Bambu Lab printers can auto-calibrate K-values:

In Bambu Studio

1. Go to Calibration menu
2. Select "Pressure Advance"
3. Choose filament and settings
4. Run calibration print
5. Results saved to printer automatically

In Bambuddy

After calibration in Bambu Studio:

1. Profiles appear in K-Profiles page
2. View and fine-tune values
3. Add profiles for specific use cases

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Understanding Flow Types

High Flow (HF)

• For high-speed printing
• Faster extrusion rates
• Usually needs lower K-value

Standard (S)

• Normal printing speeds
• Standard extrusion rates
• Baseline K-value

Create separate profiles for HF and Standard if you print at varying speeds.

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Best Practices

Per-Material Profiles

Create profiles for each material you use:

• PLA (various brands may differ)
• PETG
• ABS
• Specialty materials

Per-Nozzle Profiles

Different nozzle sizes need different values:

• 0.2mm: Usually lower K-values
• 0.4mm: Standard K-values
• 0.6mm+: May need adjustment

Testing Changes

After modifying K-values:

1. Print a test object (sharp corners work well)
2. Examine corner quality
3. Adjust K-value if needed
4. Repeat until satisfied

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Troubleshooting

No Profiles Showing

• Ensure printer is connected
• Select the correct nozzle size
• Check if any profiles exist (calibrate first)

Can't Add New Filaments

• Filaments must be calibrated in Bambu Studio first
• Bambuddy reads filament list from existing profiles
• Run a calibration print to add new filaments

Dual-Nozzle Not Detected

• Ensure printer is connected and communicating
• Nozzle count detected from temperature data
• Try disconnecting and reconnecting

Changes Not Saving

• Verify printer connection is active
• Check for error messages
• Try refreshing the page

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Tips

• Calibrate new filaments in Bambu Studio first
• Fine-tune values in Bambuddy for quick adjustments
• Document your optimal K-values for reference
• Different brands of same material may need different values
• Test with a simple calibration print after changes