K-Profiles¶

Manage pressure advance (K-factor) settings for optimal print quality across different filaments.

What is Pressure Advance?¶

Pressure advance (K-factor) compensates for filament compression in the extruder:

• Too low: Bulging corners, blobs at start
• Too high: Gaps at corners, weak lines
• Just right: Clean corners, consistent extrusion

Different filaments need different K values.

K-Profile Storage¶

Bambuddy stores K-profiles per:

• Printer - Each printer has its own values
• Filament - Different K per material
• Nozzle - Values vary by nozzle size

Retrieving K-Profiles¶

From Printer¶

Pull current K-profiles from your printer:

1. Go to K-Profiles page
2. Select your printer
3. Click Fetch from Printer
4. K-values are downloaded

What's Retrieved¶

Pushing K-Profiles¶

To Printer¶

Send K-profiles to your printer:

1. Go to K-Profiles page
2. Select profiles to push
3. Click Push to Printer
4. Profiles are uploaded

Editing K-Profiles¶

Modify Values¶

1. Click on a K-profile
2. Edit the K-factor value
3. Add optional notes
4. Click Save

Value Guidelines¶

Adding K-Profiles¶

Manual Entry¶

1. Click Add K-Profile
2. Pick the filament
3. Enter K-factor value
4. Select nozzle size
5. Add notes if desired
6. Click Save

The filament list is searchable and grouped by where each entry came from, in the order Bambuddy uses everywhere:

Each group shows its own library in full. Within a group a filament appears once — a Bambu Cloud account carries one copy of each filament per printer model, and those collapse into a single entry. The Built-in group is a static copy of the same Bambu catalogue, so it only lists filaments none of the groups above it offer.

That group is always there, so you can create a profile with no cloud account connected and nothing imported — including on a printer that has no K-profiles yet.

From Calibration¶

After running calibration:

1. Note the optimal K value
2. Add or update the profile
3. Save for future use

Calibration¶

Running K-Factor Calibration¶

Bambu Lab printers include built-in calibration:

1. Load the filament to calibrate
2. From printer or Bambu Studio, run flow calibration
3. Observe the test pattern
4. Note the optimal K value
5. Update the K-profile in Bambuddy

Third-Party Methods¶

Alternative calibration methods:

• Marlin K-factor test patterns
• Pressure advance tower prints
• Corner flow tests

Copying Profiles¶

Between Printers¶

Copy K-profiles to another printer:

1. Select source profiles
2. Click Copy to Printer
3. Select destination printer
4. Profiles are copied

Sync Status¶

Profile States¶

Keeping in Sync¶

• Fetch after printer changes
• Push after local edits
• Regular sync recommended

Comparing Values¶

View Differences¶

Compare K-values between:

• Different printers
• Bambuddy vs printer
• Different materials

Backup¶

Exporting K-Profiles¶

1. Go to K-Profiles
2. Click Export
3. Download JSON file

Importing K-Profiles¶

1. Click Import
2. Select JSON file
3. Review and confirm

Useful for backup or transferring to new installations.

Troubleshooting¶

Fetch Failed¶

1. Verify printer connection
2. Check printer is not busy
3. Try again

Push Failed¶

1. Check printer is idle
2. Verify connection status
3. Ensure no active prints

Values Don't Apply¶

1. Verify profile was pushed
2. Check material matches slicer
3. Re-slice if needed

Profile Missing When Configuring a Slot¶

The K profile dropdown in Configure AMS Slot shows the profiles that suit the selected filament preset first, then every other profile on the printer under Other K profiles on this printer. If a profile is not in the first group, look for it in the second — see which K profiles are offered.

Tips¶