I'm building my own Prusa i3 Mk3 and as many Einsy Rambo users, i'm having some trouble finding 5vdc fans, so i'm gonna make a small circuit to drive the 12v fans, looks like no one did this yet.
But here comes the first problem: i'm a mechanical engineer and my electronic skills and balls aren't bit enough to try on a brand new Einsy Rambo.
My idea comes from the ADM1028 datasheet as you can see here:


I have been looking the Einsy schematics and for me it looks like the fan's uses a simple pwm circuit control, the same used for pcs to drive 3 wire fans (fans without pwm wire/4 wires)
I think this idea is possible using a power regulator to drop the 24v power source to drive the 12v fans.

These are the fans i'm gonna use: "412" and "RLF 35-8/12 N", both made by ebm-pabst

Did it work?