Make volumes for 3D Printing in the Free MagicaVoxel!
Pattern is done in Magica, you can import an OBJ objects from Moi by Drag & Drop or build anything with Magica.
Fractal classic function but...


Matrix is filled with any cubical volumes. Press Fractal for replace all cubes by the Pattern!
Unitary Matrix maxi : 256 256 256



Each cube is now the Pattern but with only color! Press Tex for have all colors' Pattern on each cube!


It's here that you can make anything you want like select "Green" color and erase it for have only a wire buildable for the 3D Print!


For Render in MagicaVoxel ( F1) maybe you can see nothing...
it's because in Mode World (Tab) volumes are under the Ground! Just up them!