You can babysit your printer for the first 4 layers
Take your slicer and set filaments as you would if you had an AMS - make sure purge tower is activated
Now go through the first 4 layers to see in which order you have to change the colors
Start the print with the first color and then everytime it goes to print the purge tower pause the print - change the filament and resume
Takes a lot of time and also a lot of babysitting
There is no way to automatically pause the print mid-layer.
Have fun - printed multiple prints with this method and its even more satisfying if it all works :D
(Edited)
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