So I’ve been having the usual heat creep issues with the dual v3.1 toolhead, and got some 4020 fans for that and for the part cooling fans in an attempt to fix the problem. Thing was, the new fan was still putting out a pathetic amount of power. I checked the wiring in on the main board to see if there was a voltage adjustment that could be made or something.
Turns out the hotend fan was plugged into a 5v auxiliary port on the Rambo board. WTF? Is this the way all the machines are or did the previous owner of my machine do this (I doubt it)?
…Anyway I ran the fan wires straight to the power supply and now the fan is spinning really nice (yes, it is making more noise, but I’ll take it because the steppers on this thing are loud anyway, and the dual 3.1 hotend is useless with 5v power to the fan).
I searched for this issue and couldn’t find it in the forum. Anyone know what the deal is?
…And feel free to bugger your fan straight to the power supply like I did for some extra juice.
EDIT: the original fan was 5v, so I guess this was the way lulzbot intended it. Not super impressed.