24V fans are needed, but you can run 2x 12V to make 24V. keep in mind I have one 5015 fan and need to run them at 50% during prints as it tends to cool the filament too fast otherwise. A titian/volcano nozzle is what is used. ( https://www.amazon.com/Plated-Resistant-Volcano-Compatible-Filament/dp/B01LZBMOE2) As far as flex plates I like the Fulament ones. 310 x 310 https://fulament.com/collections/fula-flex-2-0/products/fula-flex-2-0?variant=32471936008266