Design 3D Kumpir Magnet

I need a printable 3D model of a Kumpir-style refrigerator magnet based on my reference photo. The final design should look clean and playful, use exactly four separate colors, and be optimized for rapid printing with almost no support material.

Key requirements
• File format: deliver the master file in 3MF so I can slice it directly.
• Printer compatibility: the model must print reliably on my Banbu A1 Combo and PS1 Combo machines (both FDM units with standard 0.4 mm nozzles).
• Surface finish: geometry should favor a smooth exterior; please avoid deep recesses that could trap layer lines.
• Print efficiency: orient features to minimize overhangs, keep wall thicknesses reasonable, and target a total print time under two hours on a 60 mm/s profile.
• Color separation: design the parts or layers so each of the four colors can be swapped or assembled without post-processing painting.
• Magnet slot: include a shallow 15 mm × 3 mm cavity on the back for a standard disc magnet.

Please model only what is visible in the reference, simplifying small details where they will not resolve on a desktop FDM printer. Send a brief note on how you approached support reduction and suggested print settings along with the file.