Dudes about fans
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Hi,
I have some doubts about fans.
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I want to place a fan on the Duet board, I have read, which is not essential, but I do not think it will hurt ... The main question is how to connect it, if as "always on" or "temperature controllers", so it would only start, when the hotend was going to extrude, which, I guess the drivers will need more cooling.
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The other doubt is that this fan has no label, and I think it is 24 v, but I am not sure. There is some way to check it?
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@peirof I suposse, another 贸ption, its conect this "case fan", to psu...
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@peirof said in Dudes about fans:
There is some way to check it?
Not really. If you connect it to power maybe start with 5v and then 12v before going to 24v.
You can make the fan thermostatically controlled to both the hotend and bed heater so that it will come on whenever either heaters are at temp. Basically the same as the hotend heatsink fan.
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@peirof not sure what board you have but I have board fans running on the MCU temp -
M308 S2 P"mcu-temp" Y"mcu-temp" A"mcu-temp" ; configure sensor 2 as thermistor on pin temp2
M950 F2 C"out9" Q500 ; create fan 2 on pin out.2 and set its frequency (CPU fan)
M106 P2 H2 T40 C"CPU fan" ; set fan 2 value. Thermostatic control is turned on -
About 20 years ago I saw a design for a fan controller in Electronic Design magazine (when it was still printed on paper). There was a sensor that turned on the fan at a specific value of power supply current. The idea was that it starts cooling before the load heats up as opposed to waiting until it's hot to start cooling it off.
If you have a quiet fan, why not just let it run all the time? I have a 5" 220VAC fan mounted on the electronics enclosure and power it from 117VAC. It turns slowly and quietly whenever the printer is powered up and blows air across the controller board. You can run 24V fans from 12V for a similar effect. Most will start and run reliably, slowly, and quietly at the reduced voltage.
I use the same arrangement for the fan that blows air over the chamber heater in my printer. The fan is simply wired in parallel with the heater. When the heater is on, the fan blows air over it to prevent it from getting super hot. It doesn't blow so hard that it creates a lot of air current that might screw up an ABS print.
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@mrehorstdmd do you find much benefit from the chamber heater?
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@jumpedwithbothfeet Yes, absolutely. If you want to print anything larger than your fist in ABS, a heated chamber is essential. I have found that setting the chamber to 50C prevents warping and splitting in ABS prints. Ideally, it should be even warmer, but my heater is only 500W and the chamber is not completely insulated, so 50C is about as high as it will go.
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@mrehorstdmd thanks I've been trying to print Nylon recently and it warps like mad, only way to sort of stop it was a bed temp of 110 which takes forever to get up to temp so I might give a chamber heater ago instead
