Extruder Motor Cooling

Markus64
Posts: 333
Joined: Thu Feb 27, 2020 4:57 pm
Location: Germany

Extruder Motor Cooling

Postby Markus64 » Sun Apr 12, 2020 11:53 pm

Hello everybody!

When I bought my Pro2 in February, I also ordered the so-called "Pro2 fan upgrade for extruder motor". However, the part is quite bulky and makes it difficult to access the left extruder. At a second glance you can quickly see that it is not an "upgrade", rather an emergency solution to cool the extruder motor at least a little.

I came up with a fairly simple solution that is effective and also very cheap. The extruder motor only gets lukewarm even during continuous operation.
The solution can be replicated very easily.


Here is a picture of the "upgrade"
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Here you can clearly see the limited space to make settings on the extruder. The fan runs constantly and at some point you can get your fingers on the fan blades. A fan guard can not be attached because the fan is "plugged" with only 3 screws, the thread in the plastic is missing ...

Image

Now for my solution:

I ordered a bundle with 4 aluminum heat sinks from Amazon. The heat sinks are 40 x 40 mm and 11 mm high. I sawed two pieces suitable for the flanks of the motor, 40 x 40 mm fits perfectly on the front. I have glued the back of the heat sink with special adhesive tape (for heat sink).

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All heat sinks glued on ...

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... and another (quiet) 40 x 40 x 10 mm fan screwed directly onto the front heat sink - of course with Fan Guard.

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... and you can get to the filament shaft again without any problems.

When connecting the fan you have to be careful and pay attention to the pin assignment! Raise has the plus side on the left instead of the right!


I will passively cool the rear extruder motor for the right motor. There are the same heat sinks in the dimensions 40 x 40 mm, 20 mm high.

I wish you lots of fun and success with the replica! 8-)

Skyline41rus
Posts: 42
Joined: Thu Jun 20, 2019 9:09 pm

Re: Extruder Motor Cooling

Postby Skyline41rus » Mon Sep 21, 2020 1:21 pm

Marcus, hello. Where did you connect this cooling fan?

Markus64
Posts: 333
Joined: Thu Feb 27, 2020 4:57 pm
Location: Germany

Re: Extruder Motor Cooling

Postby Markus64 » Mon Sep 21, 2020 2:15 pm

It is the connection in the middle.

Extruderfan.jpg

Skyline41rus
Posts: 42
Joined: Thu Jun 20, 2019 9:09 pm

Re: Extruder Motor Cooling

Postby Skyline41rus » Mon Sep 21, 2020 9:22 pm

Markus64 wrote:It is the connection in the middle.

Extruderfan.jpg

Thank you

jdaved402
Posts: 56
Joined: Fri May 03, 2019 11:33 pm

Re: Extruder Motor Cooling

Postby jdaved402 » Sat Oct 10, 2020 2:27 am

Markus,
Have you tried printing without the fan turned on? As in, just allowing natural convection dissipation with the heat sink?

Markus64
Posts: 333
Joined: Thu Feb 27, 2020 4:57 pm
Location: Germany

Re: Extruder Motor Cooling

Postby Markus64 » Sat Oct 10, 2020 7:46 am

@jdaved402,
The dealers now recommend installing (flatter) heatsinks on the motors in order to further minimize heat development. I installed the fan back then to lower the temperature even further. I installed the fan back then to lower the temperature even further. With the fan the engine didn't get hot anymore. In the meantime I have been cooling both motors with water and have found that I had to correct all profiles downwards with regard to the flow rate. The cooler the extruder motor, the more reliably the filament is fed. The two steppers for the linear drives also get over 60 ° C during printing, which is clearly bad. I will therefore also actively cool these engines with water. I consider temperatures above 45 ° C to be unacceptable. Premature wear is preprogrammed.


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