Filament Stepper Motors very hot - even when not printing with nozzle

SchMax
Posts: 14
Joined: Mon Sep 03, 2018 2:02 pm

Filament Stepper Motors very hot - even when not printing with nozzle

Postby SchMax » Thu Sep 06, 2018 8:58 am

hello @ all!

we have our pro2 printer since a good week now, and i noticed that the filament feeding motors are getting really really hot while printing.
i already read in the forum that this could be affected by retraction (mininal travel of retraction)...etc
i set the minimal retraction distance to 4mm an its still very hot!

we alredy had a filament jam right after the stepper motors (maybe because of this).
now we only print with the top-lid off (which is a bit annoying in our office space, because its a bit louder because of that).

today i noticed, even when i only print with the left nozzle, the motor of the right nozzle is very hot as well, even if it doesn't even do anything.
this is also when i print with the right nozzle only.
unfortunately i can't take any measurements, but i can't really touch them for more than a couple seconds.

is this hot temperature normal??

greetings
Raise3D Pro2
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3D Printing of Architecture Models

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Vicky@Raise3D
Posts: 4124
Joined: Fri Mar 25, 2016 3:54 am

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby Vicky@Raise3D » Thu Sep 06, 2018 10:35 pm

In the passing weeks, we do have seen some reports from customer about the heat from extruder motor affecting printing.
We are currently looking for a solution for it. Hope can achieve some progress with the next firmware.

And we will try to stop engaging the unused extruder motor which should be not necessary for a total single-extruder print.

KS_Husker
Posts: 40
Joined: Thu Apr 26, 2018 2:32 am

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby KS_Husker » Fri Sep 07, 2018 11:17 am

Good, I'm glad to hear you guys are looking into this. I hope a firmware fixe is release soon.

Ronvp
Posts: 21
Joined: Tue Jul 17, 2018 9:07 pm

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby Ronvp » Fri Sep 07, 2018 1:21 pm

I have a similar problem. The extruder motors were getting hot after about 2 weeks of use and I had filament getting stuck in the motor. More specifically, I had to take my heads apart 5x!! (and BTW, that is not quick job!!) .. I then methodically did a trace and found that if I left the printer cover off, my problem wend away. How I traced is by staying at the printer and push the guide tube out of the print head (filament still in place) and repeat that each time the tube was getting close to the head.. Thus basically: prevent the extruder from having to pull the filament thru the tube..

I then looked at it closer and found that the Print cover will put a bind on the filament tubes (thus the filament motor have to pull much harder and over time with lots of retractions, it causes the filament/tubes to bind at the top of the print head/run-out sensor and also at the brass feed-thru tube.. The binding may be exacerbated by build up from small particles being grinded off by the filament going through the tubes..

For now, I am leaving my cover of and all problems are gone..

I highly recommend for Raise to look their routing of the filament tubes..i.e.: Have a pivoting guide on top of the filament run out sensor. and possibly a better guide at the brass feed thru. This will ensure that there is never any bind between the tubes and the filament and the cover will no longer scratch from the tubes rubbing against it(or making a little taller cover, or make the guide tube from a stronger material that does not easily kink or fold..

Also, if I have a unused extruder motor it only gets mildly warm at best. This is with the cover off..

Rogman
Posts: 123
Joined: Mon Mar 21, 2016 12:37 pm

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby Rogman » Fri Sep 07, 2018 3:18 pm

is this with PLA? PLA has a very low "glass transition" temperature and should be used with the top off and the door open. here is a link to a lid prop set up that will make opening the lid a bit easier. https://www.thingiverse.com/thing:1324935 i hope this helps and you are back to printing soon.

Ronvp
Posts: 21
Joined: Tue Jul 17, 2018 9:07 pm

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby Ronvp » Sat Sep 08, 2018 1:05 am

For me it is with PLA.. I did another test and when printing with the cover on, both motors get very hot, incl the one that is not used..lot of heat accumulating near the top of the printer.. Btw.. I am ok printing with the stop off, but not with the door open.. That is just ridiculous and a a safety hazard.. Also, lots of temp variation with door open and top off.

I am planning to raise my top and drill some holes to allow hot air to vent.. I will report back..

Never the less, the guide tubes kinking and dragging is a major issue with lots of retractions...

CV-Gate
Posts: 8
Joined: Fri Aug 03, 2018 9:28 pm

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby CV-Gate » Sun Sep 16, 2018 7:42 pm

Hello, any news on this? When could we expect the new firmware to be released? I'm having this same issue. Removing the cover works sometimes but if the printer is working for some hours it will air print for sure.

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Vicky@Raise3D
Posts: 4124
Joined: Fri Mar 25, 2016 3:54 am

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby Vicky@Raise3D » Mon Sep 17, 2018 10:19 pm

CV-Gate wrote:Hello, any news on this? When could we expect the new firmware to be released? I'm having this same issue. Removing the cover works sometimes but if the printer is working for some hours it will air print for sure.


We are working very hard to fix some issues, we hope we can get everything done and release it public soon. But still not yet completely finished.
For your Air Print issue, do you meet any extrusion issue with Raise3D PLA or only filament sensitive to temperature which may be related to stepper motor but not other extruder components and settings?

SchMax
Posts: 14
Joined: Mon Sep 03, 2018 2:02 pm

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby SchMax » Tue Sep 18, 2018 1:15 pm

just an update from my side:

we have now installed heatsinks and a fan-solution provided by our germany-based distributor.
i also installed the heatsinks on the X&Y motor, just because they are very hot as well.. unfortunately i don't know where the Z motor are exactly or how i can get to them..

since the no problems what so ever - even on 24h prints!

links below:
https://www.3d-drucker-experte.de/raise ... erie?c=269
https://www.amazon.de/gp/product/B07913 ... UTF8&psc=1
Attachments
2018-09-18 15.13.43.jpg
2018-09-18 15.14.15.jpg
Raise3D Pro2
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3D Printing of Architecture Models

KS_Husker
Posts: 40
Joined: Thu Apr 26, 2018 2:32 am

Re: Filament Stepper Motors very hot - even when not printing with nozzle

Postby KS_Husker » Tue Sep 18, 2018 3:28 pm

What heat sinks did you put on the motors, and where did you get them please?
I want to do the same exact thing on ours.


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