I have been letting my zucchini's grow and grow
Well past eating stage,
Easy seed harvest from the dry zucchini.
Cut the fresh zucchini and scoop out the flesh,
Most of the seeds will be down the bigger end.
Place in a bucket of water and leave for a couple of days.
The seeds will be easy to separate from the flesh,
I think they will sink to the bottom....
Same wet method can be used for cucumber