Is there a way to set the connect-therm-E-fan-0 to a certain speed?

3D Printing
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1

Is there a way to set the connect-therm-E-fan-0 to a certain speed? I only need the fan to blow about 50%. Also related to that when I slow the speed on the fan I get a pwm whine, is there any way to change the frequency of the fan pwm to get rid of it?

2

What kind of hot end are you using?

3

M141 P0 F1000 S0.5

P is the fan number
F is the PWM frequency (I think 1,000 Hz is the default maybe?)
S is the on-time from 0…1

4

I’m using an e3d v6, but swapped out the stock fan for a blower fan. It has a lot more air flow, that’s why I’m trying to slow it down. Mark, 141 is for heated enclosure, 106 is for fans. Thanks for pointing out the frequency parameter though, I hadn’t noticed it. Tried several different values, and it doesn’t sound like they are having any effect.

5

Yes M141 on the g-code wiki page says heated enclosure, but that’s not what Redeem’s source code says:

https://bitbucket.org/intelligentagent/redeem/src/0dc7929320eec5f4573579aab4fb31ddaab8bbbd/redeem/gcodes/M141.py?at=master&fileviewer=file-view-default

6

And M106 doesn’t take a frequency parameter. https://bitbucket.org/intelligentagent/redeem/src/0dc7929320eec5f4573579aab4fb31ddaab8bbbd/redeem/gcodes/M106_M107.py?at=master&fileviewer=file-view-default

7

Thanks for showing me where the code was, it helped a ton. I tried out M141, but that wasn’t working either. Turns out set_PWM_frequency() isn’t implemented in Fan.py. I ended up just setting PWM.set_frequency(100) in the fan init. I also hard coded the fan to go on at half speed in Cooler.py, but it would be nice to have a way to modify it in the config.