If your slicer prints more than one filament, one of the files should fit: painted 3MF for slicers that read filament painting, parts 3MF or STL per filament for the others. I have sliced the painted 3MF and the parts 3MF with the slicer of my own four tool printer. I have not sliced the other kinds in every slicer yet, and the day I do I will say so here. If a file opens wrong in yours, write to me.

Start with Painted 3MF: it is the lightest and keeps the model as one closed object. If it opens without colours, try the second dialect. If your slicer does not read painting at all, use Parts 3MF, its standard version, or STL per filament.

That is the whole idea. Each layer is one pure filament and the eye blends them on the print. If the stripes are thicker than one layer, the layer height or the first layer height in the slicer is not the one you gave the add-on. Set them equal and slice again.

Colours and real size. Colours can be a colour attribute (vertex paint), a texture on the base colour or plain materials. Photo textures and scans work too: turn on Fit to my filaments and Clean whites. Size is read as 1 unit = 1 mm, or from the scene units if you prefer. A closed mesh is needed for the solid parts. The painted file also works on a mesh with small holes, but your slicer may complain about them as it would anyway.

Blender 4.2 or newer. I install the release zip and run it in Blender 4.2, 4.5, 5.0 and 5.3 on Windows, and the full automatic tests run on Blender 5.3 on Linux. The add-on is plain Python with no compiled parts, so macOS should behave the same, but I have not run it there myself yet. It installs as an extension from the zip.

The screen colour is an estimate. First set each spool to its real colour in step 1. If whites print pink, raise Clean whites. Then use Mixes of mine to push a colour where you want it: more parts of a filament, or a different filament. Thinner layers and translucent filament blend better. Without a black spool there are no dark colours.

It depends on the model and on the look. On my test vase the slicer estimate went from 3 h 20 min with slicer side mixing to 2 h 48 min with the Fastest preset. A model with few colours gains more than a rainbow, and the two filament, hologram and gradient looks need one or two tools a layer. Try every look shows the count for each look on your model, and the Check step gives the exact number before you export.

Yes, what you make is yours, with no royalty. The bonus nigiri keychain 3MF that comes with the add-on may be printed and the prints sold; the file itself may not be shared or resold. Updates and support are included for good. The add-on has no AI inside and never goes online. AI helps me write code and translate the documentation, and I check the results myself.