Core One L Manual MMU

This config will allow you to print in up to 4 colors without having an actual MMU. It's tedious but not terrible for printing logos/raised text/svgs.

Prerequisites

• PrusaSlicer 2.9.5 or later

• Core One L config .ini file

• Test print .3mf file

Step 1: Import the printer profile

1. Open PrusaSlicer

2. Switch to Expert mode — top right corner, select Expert from the dropdown

3. Go to File → Import → Import Config…

4. Select the .ini file

5. You should see a confirmation that the profile was imported

Verify it worked: click the Printer dropdown (right panel) and confirm Core One L HF0.4 nozzle - 4 colors(or whatever if you renamed it) appears in the list. Select it.

Step 2: Load the 3MF

1. File → Open… and select the .3mf

2. PrusaSlicer will load the model and attempt to restore the settings embedded in the file

3. If prompted about profile conflicts, choose to keep the settings from the file

Step 3: Verify settings loaded correctly

Check each of these before slicing:

Printer Settings tab:

• Extruders count matches your intended color count (4)

• Single Extruder Multi Material: checked

• Single Extruder MM Setup (you may have to tinker with the last two settings based on your filament):

  • Cooling tube position: 65mm

  • Cooling tube length: 15mm

  • Filament parking position: 5mm

  • Extra loading distance: -7mm

• For each extruder slot: Retraction when tool is disabled → Length: 0mm

• Tool Change G-code:

{if previous_extruder != -1}
M400
M117 Next: {filament_preset[next_extruder]}
M600
{endif}

THE EMPTY LINE AT THE END IS REQUIRED!

Print Settings tab → Multiple Extruders:

• Wipe tower: enabled

• Prime all printing extruders: unchecked

Step 4: Assign filaments

In the right panel on the Plater tab you'll see filament slots, one per "extruder". I recommend making copies of the filaments but selecting a different color to be able to easily see what is what. e.g. Basic PETG - color 1 (select black), Basic PETG color 2 (select red), etc...

Step 5: Assign colors to the model

1. If its multiple objects, just click the "extruder" on each object (even subobjects) to select what extruder you want.

Step 6: Position the wipe tower

1. In the Preview or Plater view, the wipe tower appears as a rectangular block

2. Drag it to the front-right area of the bed. The M600 gcode parks the head front-right, so this minimizes travel distance after the filament change

3. Make sure it doesn't overlap your model

Step 7: Slice and check the G-code

1. Hit Slice now

2. Go to Preview tab

3. In the layer slider, find a layer where a color change occurs

4. Look for the wipe tower section at that layer — verify it appears on both sides of the color change (old color finishing, new color purging)

5. Use the bottom slider to see the order to load filaments for a specific layer

Printing

1. Make sure "door sensor" is disabled, otherwise you will get unexpected pauses when you change the filament. LCD -> Settings -> Hardware -> Door sensor (make sure off)

2. Send to printer via PrusaLink, USB, or export G-code to storage

3. At print start: dismiss the "wrong filament type" warning with OK, this is expected and harmless

4. Print runs normally until the first color change

Color change procedure (repeats for each change)

At each color boundary the sequence is:

1. Printer finishes the current color's section on the wipe tower

2. M400 flushes the move buffer

3. M117 sends the next filament name (visible via PrusaLink if connected)

4. M600 fires — bed drops slightly, head parks front-right

5. On the touchscreen: follow the unload prompts — the printer retracts the old filament automatically

6. When prompted: pull the old filament out cleanly, insert the new filament, push until you feel resistance

7. Confirm on screen — printer loads and purges the new filament

8. Grab the purge string hanging from the nozzle — hold it gently but don't pull

9. Printer moves to wipe tower, purges new color — the purge string pulls away cleanly as it travels

10. Print resumes normally