Based on LeoDuhVinci’s Model: https://www.thingiverse.com/thing:633081
Only change i made is to add vent to the drain hole (which is on a flat bottom on his model, and has difficulty draining if placed on a flat surface) to the sides of the model.
If your temp is correct for your filament and your bridging is good, this needs no supports.
I printed at .06 layer height or less for a smooth finish.
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