There are 2 threaded parts that allows you to combine colors and dispose drain water in a bottom one. Split them in a slicer into objects before printing.

Printer settings: 

1. Filament: any except flex
2. Layer: 0.2mm or adaptive for better threads.
3. Infill: 50% or less
4. Walls:  3-3-3
5. Supports/rafts: only for the upper part close to drain holes.

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