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Siggi Bjarnason
(@siggi-bjarnason)
Active Member
Print Fan Error

My printer started doing something new yesterday. It would pause the print job with "Err: PRINT FAN ERROR", I could resume the print job and it would continue for awhile and then do it again. Yesterday it would go for maybe 30 min before doing it again. Ambient temperature in the room was close to 30 C, so I thought maybe it was too hot in the room so I opened up window and turned on fans which brought the ambient temps down by few degrees. After this the printer finished an 18 hour print job without an issue. This morning I started a 45 hour print job and it would do this every few minutes despite the ambient temp being about 25C with the window still open and same fans still going so i cancelled the job and turned off the printer (after unloading the filament and cool down).

Anyone have any clues as to what is going on and how I can get the printer back to it's reliable self?

Posted : 12/09/2021 12:48 pm
Neophyl
(@neophyl)
Famed Member

Most likely you have a faulty wire, either connection or more likely an intermittent wire break. When it gets to a certain bend radius the wire ‘breaks’ and the feedback stops so the printer detects and error and stops. They can be very tricky to fault find and usually it’s easier to just run new wiring. 

Posted : 12/09/2021 2:55 pm
Diem
 Diem
(@diem)
Noble Member

It can also be a build up of fine strands, loose stringing, tangling the fan hub, or sometimes just excessive dust distorting the blade profile; so the quickest first check is to clean the fan(s).

It may be enough to use a stiff paintbrush to degunk the blades but if there are hairs in there tweezers or a needle will help.   In bad cases you may have to unscrew the fan to get at the back.

Cheerio,

 

Posted : 12/09/2021 5:37 pm
jsw
 jsw
(@jsw)
Noble Member

I got this a while back and it turned out to be various crud in the fan, which I blew out with canned air.

There is an option, IIAC, to disable the fan check if it becomes annoying.

Posted : 12/09/2021 5:47 pm
Siggi Bjarnason
(@siggi-bjarnason)
Active Member
Topic starter answered:
fan seem fine.

Don't see anything in the fans. I blew it out with canned air just in case but no difference. Here are pictures of my fans.

Disabling this warning seems like a really bad plan.

Bad wire seems like a stretch considering I haven't printed that much in the relatively short time I've had it.

Posted : 16/09/2021 4:22 pm
jsw
 jsw
(@jsw)
Noble Member

When you get the beep and the error message and attempt to resume the print, is the print fan (the one on the front of the extruder) turning or at least attempting to spin up, or is it stalled?

If it is turning, you can (at least with the firmware version I run) disable the print fan check on the front panel.

Posted : 16/09/2021 4:38 pm
Siggi Bjarnason
(@siggi-bjarnason)
Active Member
Topic starter answered:
not sure

Didn't pay attention to the fan blades, is it supposed to be running all the time. I do know they come on and stop, figured that was by designed that they came on cooled things down and turned off. I'm running latest firmware BTW

Posted : 16/09/2021 4:43 pm
jsw
 jsw
(@jsw)
Noble Member

Usually the fan should be on once the Z is above the first layer.

My question was intended to tell if the fan was indeed stopped, indicating a valid alarm, or if the fan was running, indicating a false alarm.

Posted : 17/09/2021 6:19 am
Siggi Bjarnason
(@siggi-bjarnason)
Active Member
Topic starter answered:
Where is Prusa Support?

I get that, I was just trying to understand normal state. I'll have to run another test and see. BTW when I bought the printer there was a lot of claims about award winning support, etc., but now that I need them I can't find any way to contact them. Are they now MIA or do you know what the deal is there?

Posted : 17/09/2021 2:42 pm
JoanTabb
(@joantabb)
Moderator
Support is here

Prusa have a Chat service, on the bottom right hand corner of this page 

https://shop.prusa3d.com/en/

the chat box,  takes about three seconds to appear after the page starts to load.  

this is usually the quickest way to get Prusa Support... 

another alternative is to use the email address...    [email protected]    this in not particularly fast. 

this forum is populated by users with varying levels of expertise.   Prusa staff look in from time to time. but the primary route to market is via chat

If you have ideas for improvements to software, hardware or firmware, then the appropriate Git Hub page is the best place. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK...
Posted : 17/09/2021 6:01 pm
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