Extremely hot motor  

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ciscolara
(@ciscolara)
Eminent Member

Hello guys I have a summer problem here. I have my machines since winter and now we are in summer and it's really hot here. I never had problems with the gears skipping on the filament. But I also never did print in summer before or tried to print PETG. Well my motor it's getting so hot that I can barely touch it for a few seconds. Last week I couldn't even print PLA and the prusa chat recommended to add thermal paste inside the extruder. And that fixed the issue but only with PLA. Now that I am working with PETG with higher temperature after 1 hour of printing I start getting the motor so hot and the gears don't grab real well filament. I had a problem like that before also with PET. At 270 degrees Celsius. Now I am printing at 255 degrees Celsius and I still have problems. Any advice on how to fix this issue? I have read that adding a fan on top of the motor will help to cool down the motor but will that help with the skipping problem? I have the tension screw just right and even if I slow down the printing speed I get the skipping. Thanks for the help. 

Posted : 14/01/2020 3:40 am
padigree
(@padigree)
Trusted Member

If the motors get that hot, I don't wanna know how your TMC2209 drivers will feel in their sauna.. 

I dont understand why they don't add a simple blower or some good heatsinks to the board.

Skipping is more often caused by too hot motor drivers. Sure, if your stepper itself is glowing, this could also be a cause.

Printing on hot summer days could also be as hard as on cold winter days with extremely low ambient temperature.

Give it a try (you dont have to install a fan properly, simply use something that blows the heat "a bit away" and watch if there is 

any improvement.

 

Kind regards

It’s better to give than to receive. Especially advice....
Posted : 14/01/2020 5:54 am
crawlerin
(@crawlerin)
Honorable Member

Wait, MINI was not out half a year ago... how did you get it? Were you some super-early-pre-alpha tester? 😮 

Either way, if you have MK3, people had some success with sticking aluminum heatsinks to motor which helps dissipate heat a bit. Airflow helps too but don't blow on print area, prints will warp.

Posted : 14/01/2020 1:52 pm
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nikolai.r
(@nikolai-r)
Noble Member

Let us know your ambient temperatures. Hot motor on the MK3 ( I assume you have MK3 and not Mini ) is nothing unusual.

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Posted : 14/01/2020 6:29 pm
Karl Herbert
(@karl-herbert)
Famed Member

I regulated my extrudertemp. problems (over 60 degree) with a simple 40x40 noctua fan and a printed housing. The temperatures dropped to 35 degrees.

additional weight: approx. 20 grams. Air blows to the Extruder gears and not to the printbed. I used an external Meanwell 12V Powerunit.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 14/01/2020 8:32 pm
ciscolara liked
ciscolara
(@ciscolara)
Eminent Member

@padigree

Thanks for the reply. I already try a house fan that I place near the printer blowing from bottom to top. it did not help at all in the problem. but it did reduce the temperature of the motor a bit.

Posted : 14/01/2020 8:37 pm
ciscolara
(@ciscolara)
Eminent Member

@crawlerin

oh my god I am sorry I did not realized that this was the mini forum section. I saw the problem I was reading and I decided to post and I did not look correctly. I have the MK3S

Posted : 14/01/2020 8:38 pm
ciscolara
(@ciscolara)
Eminent Member

@nikolai-r

I have the MK3S and today for example temperature here in my city its 32 degrees celcius. inside my room it gets easily at 35. I dont have a thermoter. I am waiting to arrive here in the mail soon.

Posted : 14/01/2020 8:40 pm
crawlerin
(@crawlerin)
Honorable Member
Posted by: @ciscolara

@crawlerin

oh my god I am sorry I did not realized that this was the mini forum section. I saw the problem I was reading and I decided to post and I did not look correctly. I have the MK3S

Lol that's ok, we figured 😀 But you never know, you could have been tester of some early unit who faces problem with hot motor now, but I guess in tgat case you are close enough to Prusa Research that you wouldn't need to go to public forums. Now, of all the initial complaints about MINI I haven't seen hot extruder motor yet.

If it causes issues with extrusion, you may be facing heat creep from hot motor to gears and in that case cooling motor may be a good idea.

Posted : 15/01/2020 1:44 am
zoltan
(@zoltan)
Member Moderator

Moving to the correct thread, probably more people will join. 

This post was modified 7 months ago by zoltan
even an old man can learn new things 🙂
Standard I3 mk3s, FW 3.9.0, no closed box, sketchup , fusion 360, PrusaSlicer, Windows 10
PRUSA MINI FW 4.1.0, technical background...
Posted : 15/01/2020 7:43 am
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