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thanks for your answer.

  1. So it would be the best to put the original supply out of the box because heat and also a separate one with 12V and 5A? Normally with a step-down converter it would be also possible to connect directly to the 24V PSU and also to the 12V PSU.

But I think to took the 12V PSU also because its easier to connect the fans directly to the PSU isn't it?
You also write itÄs better to need a fuse. Is it really necessary?

  1. A cool, you developed your one pcb design. Nice.

But to modifie the firmware is not necessary? because I will use my own prusa build with completly different firmware.

Do you think I will be able to rebuild it with your 10-EUR-instruction? I am good in soldering :D