NAMCO: Not An MMU for Core One (L) - Multi material with manual swaps

Unlock multi color printing for free by manually swapping the filament.

Works amazingly well for simple, small dual or triple color models. You could go to a lot more in theory but you have to babysit the printer and do each changes by hand, so maybe not the best idea.

I have included a simple model to test the functionality, it's a simple 50x50x1mm square that shouldn't take to long to print, even with the filament changes (sub 10 min with 0.6 nozzle and 0.4 layers)

If you'll be doing this a lot I recommend checking out my dual spool holder, makes changing filament much easier!

Creating a printer profile in PrusaSlicer

in the printer tab, under General, Co to the Capabilities settings and increase the amount of extruders to the maximum amount of colors needed.

New extruders should be available in the drop down menu:

Next, Still in the Printers tab, select the "Custom G-Code" menu. In the "Tool change G-code" text box, copy the following commands:
{if layer_z > 0}
M600 N; Color change, no return
{endif}
This will automatically trigger the color change option.
Save the setting under a new name, it will appear as a new printer

Slicing

Slice like you would any multi color print: Assign an extruder to each stl (Or part of it), then slice.
I recommend enabling the Wipe tower under Print settings> Multiple extruders, as your filament will ooze when exiting filament change settings

When starting the print, your printer will give an error message, saying that a wrong type of filament is loaded. This is normal as the printer only has one material loaded and sees 2 material in the Gcode. You can just click continue and it will all work fine