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Thanks for the reply. Yes, I had that Idea to let the brackets span the long axis of the board too but then decided for a complete housing containing two fans - one of the many available here on thingaverse.

Fixing the brackets on the stepper drivers suffers from the same lack of real space. And I would be reluctant to risk a loosening of the drivers in their sockets by applying such a long levered mass to them

But generally your concept is optimal - and so minimalistic it can't be beaten... ;)