MakerGear Forum

Aloha Guys, I switched over to the v4 last weekend and replaced some of the harness.
After firing it back up everything was working except for fan0.
Moved the fan to fan1 connection and it worked.
Checked the voltage on the fan0 connector and its reading 16 volts DC.
A 40mm 24v fan works fine on it but the 24v 50mm fan isn't spinning up.
For now I'm cooling with a 40mm fan.
Any ideas?
Mahalo, John

possibly silly question but did you send the command:

M106 s255

Using Octoprint I clicked the fan on button and it wasn't working.
I tried a M106 S100 thinking the number was the percentage of speed(doh!) and that didn't work.
I did remove the e3d v6 which has a 40mm fan for cooling. That worked fine with the Octoprint fan button.
But no I did not. Will give it a shot when I get home.
Thanks Matt

Common mistake.

40mm fans are PWM enabled so they can make sense of a M106 S100 command

The 50mm fan is not PWM so it definitely needs either 0 or 255.

yes when you hit fan on in octoprint it doesnt send m106 s255. i dont know exactly what it sets the fan to but its not full speed. you need to send that command manually. using fan on in octoprint with a non pwm fan, even if it spools up will eventually overheat and stop. i have also had problems with octoprint sending a command value at 255. if i send M108 S255 for instance it will not send it but if i send M108 S254 it will send that just fine. very strange

forgot to test last night but found this page on modifying the control settings.
http://docs.octoprint.org/en/master/fea ... trols.html
Looks like I can add a slider for the fan speed.
Mahalo, John

That was it guys. Sending a M106 S255 worked for the 50mm.
Then I spent an hour or so trying to figure out how to modify the fan on button but realized the s3d gcode file sends the S255 command in the gcode.
So no need to edit it i guess. Another doh!
Thanks again.

the fan on button just sends a M106 with no S specified.
Just fyi