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Does the motor/pump work at all, spraying water around inside? If yes, and there are no clogs, check the drain solenoid - it should actuate a valve that directs the pumped flow of water through the drain pipe instead of the sprayers.

Nothing too fancy! Mostly just designing a lot of thickness and buttressing into the part, and then slicing with thick walls, dense triangle infill, and an orientation that puts the layer lines perpendicular to the highest stresses.

I built a friction drive for my bike with a load-bearing PLA motor mount (cheap crappy PLA, too), since I don’t have the equipment or ventilation for much else. With a bit of overengineering, it’s been doing great for almost a year now, despite all the heat and force thrown at it.