e3d 12V always on fan on Ultimainboard rev 2.1.4

[lars-busack 0]

Hello everyone,

i want to hook up the 12v e3d hotend fan to a UltiMainBoard rev 2.1.4, but i'm scared of the 19-24v output. Did this before on a Solidoodle2 and took the 12V parallel from the power supply, but UMO runs at 24v...

I am neither an electronics guy nor a pragrammer, which is why I couldn't get any helpful information around here, although similar questions have already been answered in previous topics. So please excuse my stupidity; i need an answer as simple as possible:

Where on the UMB 2.1.4 can i safely connect a single 12V-always-on-fan?

It would be really great to do it without soldering resistors or recompiling firmware, as it's just a stupid 12V always-on fullspeed fan... I find it hard to imagine that there isn't any 12v constant output in UMB2.1.4??

Thank you very much in advance,

Best regards,

Lars

[amedee 349]

There is no 12v on the UltiBoard 2.1.x

It is essentially 24v, and 5v mainly for the electronics and the hot end fan.

If you want to use and E3D hot end, you need the 24v version.

For the fan you could use a step-down / regulator to go from 24v to 12v, but is is probably easier to mount a 5v or a 24v fan.

For the hot end, you should really go for a 24v heater cartridge.

[lars-busack 0]

For the fan you could use a step-down / regulator to go from 24v to 12v, but is is probably easier to mount a 5v or a 24v fan.

For the hot end, you should really go for a 24v heater cartridge.

Thanks for your quick reply!

I should have clarified this a bit... I have a spare 24V heater cartridge (from UMO+) and some old e3d metal parts, along with an original 12v e3d fan and just wanted to see if i got this semi-original setup running...

But now i guess it's easiest to get a new fan.

Thank you very much!