Upgraded Mini Kossel to E3D V6 hot end; how to turn on print fan?

I got one nasty clog in my J-head hot end that made me decide to upgrade.
The V6 hot end fan is connected like the fan on the J-head, and thus runs like it should (all the time). This fan blows directly onto the hot end, and I now also have a fan directed straight onto the print. The "new" (print) fan is connected to d9 on the RAMPS board, but it hasn't run once since I hooked it all up.

So the question is: do I have to do anything to make it work? I was told to just "keep the slic3r settings to default" and I should be fine, but honestly I don't think anything in slic3r will help me get that fan going... Or?

Thanks for any answers,
Edward

Edited 1 time(s). Last edit at 05/04/2015 05:16PM by Eddy.

D9 pins have polarity. If the E3D fan is plugged in reverse order, it would not turn.

I did connect it the way it said on think3dprint3d.com, but maybe I should try to switch it again just to see.
No more obvious things besides that?

Quote
Eddy
So the question is: do I have to do anything to make it work? I was told to just "keep the slic3r settings to default" and I should be fine, but honestly I don't think anything in slic3r will help me get that fan going... Or?

Try sending M106 S255 to test the print cooling fan.

Edited 1 time(s). Last edit at 05/05/2015 03:59AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Quote
dc42

Quote
Eddy
So the question is: do I have to do anything to make it work? I was told to just "keep the slic3r settings to default" and I should be fine, but honestly I don't think anything in slic3r will help me get that fan going... Or?

Try sending M106 S255 to test the print cooling fan.

Good idea, thanks!

Inside Slic3r, on "Filament Settings" tab, under "Cooling".

That's where I've been fiddling around with different settings to no avail... Is there anything there that will make the print fan start? The hot end fan is always on like it's always been...

(will test M106 S255 in a few days, I'm having the hot end out for a small service and had to change thermistor and solder a little on Z-probe end stop)

It was a polarity issue
I had it wired correctly at the RAMPS board, but wrong in the fan-to-wiring loom connection.

But it still doesn't run when I print, so what have I done wrong in my cooling set-up? It's set to Always on...?
Or do I have to enable D9 in some way in Marlin?



Thanks guys

Edited 2 time(s). Last edit at 05/10/2015 06:45AM by Eddy.

No need to set it always on.

Set Min Fan speed to 40, Max Fan speed to 100. Increase Bridges speed to 100 as well. Set Disable fan for first [ 1 or more ] layers.

Then you're good to go.

Edited 4 time(s). Last edit at 05/10/2015 09:52AM by boksbox.

And that did the trick, hooray!! thank you!