Convert PNG to Multi-color 3MF

I need a PNG image converted into a multi-color 3MF file for 3D printing. The 3MF file will be used on a multi-material 3D printer and needs to include 4 distinct colors.

Requirements:
- Convert provided PNG into 3MF format
- Limit the design to 4 colors
- Ensure compatibility with multi-material 3D printing

Ideal Skills:
- Experience with 3D modeling software
- Proficiency in 3MF file creation
- Familiarity with multi-material 3D printing processes

Please provide samples of previous work with similar requirements. Thank you!