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Extruder Motor getting too hot  

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Valler
(@valler)
Active Member
Extruder Motor getting too hot

Hi, I recently notice that Extruder Motor get too hot to touch after 15 mins of print and all my 2 hours+ print job with PLA are all failed.
Due to the fact that heat from motor transfer to shaft and make the PLA mushy then it could not pass through ptfe tube >>> result is clog in mid print.

I found similar problem in below post too.
https://shop.prusa3d.com/forum/others-archive--f66/mk3-extruder-motor-getting-hot-t12726.html#p78057

But no one seem to found solution yet.

Could anyone enlighten me is there anyway to solve this problem?

Ps. I'm at Bangkok Thailand which currently is summer and room ambient temperature is around 28-30 C.

Postato : 16/04/2018 3:27 am
x50arm
(@x50arm)
Estimable Member
Re: Extruder Motor getting too hot

One suggestion I’ve seen is to raise your print temperature. The theory is that it is working too hard to push the filament.

Postato : 16/04/2018 3:34 am
Valler
(@valler)
Active Member
Topic starter answered:
Re: Extruder Motor getting too hot

Thanks for reply Allen.
I'll try that in next print.

Updated: Just change temp from 210 -> 215, not thing change much from previous print.

Postato : 16/04/2018 5:51 am
NiHaoMike
(@nihaomike)
Eminent Member
Re: Extruder Motor getting too hot

Stick a small heatsink on top of the motor. A small NB heatsink from an old motherboard works nicely.

Inspired to get into 3D printing by Micah Elizabeth Scott, Naomi Wu, and an anonymous Bitcoin girl I met in college.

Postato : 16/04/2018 6:16 am
Valler
(@valler)
Active Member
Topic starter answered:
Re: Extruder Motor getting too hot


Stick a small heatsink on top of the motor. A small NB heatsink from an old motherboard works nicely.

That was I though!!
But I don't have any of that available right now so I just order one via online this morning.
Will try as soon as it arrive 😀

Postato : 16/04/2018 10:21 am
thrawn86
(@thrawn86)
Honorable Member
Re: Extruder Motor getting too hot



Stick a small heatsink on top of the motor. A small NB heatsink from an old motherboard works nicely.

That was I though!!
But I don't have any of that available right now so I just order one via online this morning.
Will try as soon as it arrive 😀

I bought some 40mm heatsinks on amazon for 10$ w/ thermal epoxy. also keep in mind its normal for it to run at 90+C or more

Postato : 18/04/2018 3:18 am
Zcubed
(@zcubed)
Eminent Member
Re: Extruder Motor getting too hot

I also added heatsinks which just delays the issue for longer prints. You could try my fix for this issue here: https://www.thingiverse.com/thing:2867249

I had the exact same issue so I reduced the spacing between the tube and bondtech gears to create a direct path.

https://www.thingiverse.com/zcubed/things
Postato : 18/04/2018 3:29 pm
chris3030
(@chris3030)
Trusted Member
Re: Extruder Motor getting too hot

I wonder if adding a small fan to the heatsink would solve it? I'm assuming the one you tried was passive without a fan?

Postato : 20/04/2018 2:46 am
Erik
 Erik
(@erik-3)
Estimable Member
Re: Extruder Motor getting too hot


I also added heatsinks which just delays the issue for longer prints. You could try my fix for this issue here: https://www.thingiverse.com/thing:2867249

I had the exact same issue so I reduced the spacing between the tube and bondtech gears to create a direct path.

How has this fix worked out so far? I know it's only been a few days, but have you printed enough to see if this actually resolved your problem?

Postato : 23/04/2018 1:54 pm
Kwaad2
(@kwaad2)
Honorable Member
Re: Extruder Motor getting too hot

You shouldn't get into the 90s.
PETG starts to get soft at 80c.

(That image was a mistake where I left extruder motor power set too high)
It was 96c when I first found it.

Hi, I'm Sean. I used to work on CNC machines.
I try to not make mistakes, but the decision is YOURS.
Please feel free to donate to my filament/maintance fund.

Postato : 23/04/2018 2:02 pm
Zcubed
(@zcubed)
Eminent Member
Re: Extruder Motor getting too hot



I also added heatsinks which just delays the issue for longer prints. You could try my fix for this issue here: https://www.thingiverse.com/thing:2867249

I had the exact same issue so I reduced the spacing between the tube and bondtech gears to create a direct path.

How has this fix worked out so far? I know it's only been a few days, but have you printed enough to see if this actually resolved your problem?

I've been printing pretty much continuously for 5 days with no signs of wear on it or any clogs/jams since. I have been printing mostly in low temp PLA with most prints being over 10 hours. My motor hovers around 55C even during such long prints and this is with passive heatsinks, no fans.

https://www.thingiverse.com/zcubed/things
Postato : 23/04/2018 3:09 pm
Masher
(@masher)
Active Member
Re: Extruder Motor getting too hot

It appears this will be addressed in the next firmware update by reducing the amperage to the extruder to the same level as used for mk2.

https://github.com/prusa3d/Prusa-Firmware/commit/5a9cc39562fdf6804e3dafdc241226c4f2f6fc7a

Postato : 25/04/2018 1:00 am
Erik
 Erik
(@erik-3)
Estimable Member
Re: Extruder Motor getting too hot


It appears this will be addressed in the next firmware update by reducing the amperage to the extruder to the same level as used for mk2.

https://github.com/prusa3d/Prusa-Firmware/commit/5a9cc39562fdf6804e3dafdc241226c4f2f6fc7a

Can we reduce the extruder motor power via GCode in the meantime? All of my eSun PLA+ (3 rolls) jams inside the gear housing at about 45 minutes. My Hatchbox PLA runs fine, but I'm about out.

Postato : 26/04/2018 8:39 pm
Nikolai
(@nikolai)
Noble Member
Re: Extruder Motor getting too hot


Can we reduce the extruder motor power via GCode in the meantime? All of my eSun PLA+ (3 rolls) jams inside the gear housing at about 45 minutes. My Hatchbox PLA runs fine, but I'm about out.

Yes, we can! Set new values:
Holding currents: M911 X16 Y20 Z35 E26
Running currents: M912 X16 Y20 Z35 E26

Often linked posts:
Going small with MMU2
Real Multi Material
My prints on Instagram

Postato : 27/04/2018 12:55 am
Kwaad2
(@kwaad2)
Honorable Member
Re: Extruder Motor getting too hot


Yes, we can! Set new values:
Holding currents: M911 X16 Y20 Z35 E26
Running currents: M912 X16 Y20 Z35 E26

Holding currents: M911 X16 Y20 Z35 E26
Running currents: M912 X16 Y20 Z35 E26
Apply Settings to Trinamic Drivers: M910

I'm just gonna throw this out there, as, this fix, apparently fixed a few of my issues...

I repleaced my heatbreak.
I was having similar issues where my stepper motor was getting VERY VERY hot, and experienceing Jams, VERY consistently at certain spots in certain prints.

After replacing the Heatbreak, my extruder motor is running *MUCH* cooler, and no more jams.

Hi, I'm Sean. I used to work on CNC machines.
I try to not make mistakes, but the decision is YOURS.
Please feel free to donate to my filament/maintance fund.

Postato : 27/04/2018 3:43 am
reid.b
(@reid-b)
Reputable Member
Re: Extruder Motor getting too hot



Holding currents: M911 X16 Y20 Z35 E26
Running currents: M912 X16 Y20 Z35 E26
Apply Settings to Trinamic Drivers: M910

The M910 command is not supported in the Prusa firmware.

Postato : 27/04/2018 5:26 pm
RH_Dreambox
(@rh_dreambox)
Prominent Member
Re: Extruder Motor getting too hot

You have a mechanical problem with your printer. Try to find the reason why the motor has to work so hard.
I measure the temperature regularly on my extruder motor with an external instrument, and never exceed 55°C regardless of print or print length.

Bear MK3 with Bondtech extruder

Postato : 27/04/2018 7:20 pm
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lucas.c3
(@lucas-c3)
Trusted Member
Re: Extruder Motor getting too hot

what kind of mechanical problems would cause this?

Postato : 20/05/2018 8:14 am
RH_Dreambox
(@rh_dreambox)
Prominent Member
Re: Extruder Motor getting too hot


what kind of mechanical problems would cause this?

Typically, the Teflon tubes have been deformed, causing the filament to not run smoothly through the tubes.
It may also be because the Bondtech wheels clamping screws are too tightened so that the wheels are no longer parallel.

Bear MK3 with Bondtech extruder

Postato : 21/05/2018 5:31 pm
lucas.c3
(@lucas-c3)
Trusted Member
Re: Extruder Motor getting too hot

Typically, the Teflon tubes have been deformed, causing the filament to not run smoothly through the tubes.
It may also be because the Bondtech wheels clamping screws are too tightened so that the wheels are no longer parallel.

Are there any guides on replacing does tubes? Im going to take some of my printer apart for maintenance might as well check this to.

Postato : 21/05/2018 6:02 pm
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