Another filament cooling mod

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D3rax
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Re: Another filament cooling mod

Post by D3rax » Mon Jul 14, 2014 7:00 am

This is also a nice design (not mine)http://www.thingiverse.com/thing:200072
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roller
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Re: Another filament cooling mod

Post by roller » Mon Jul 14, 2014 2:15 pm

D3rax wrote:This is also a nice design (not mine)http://www.thingiverse.com/thing:200072
That style doesn't work for people in hot climates like me - I tried. Had to stick a peltier in the middle - which was fun :)

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printmo
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Re: Another filament cooling mod

Post by printmo » Mon Jul 14, 2014 4:05 pm

ming wrote:Congratulations for trying something different and resolved the PLA heat issue.
Thank you!

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JuliaDee
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Re: Another filament cooling mod

Post by JuliaDee » Tue Jul 15, 2014 1:32 am

roller wrote:
D3rax wrote:This is also a nice design (not mine)http://www.thingiverse.com/thing:200072
That style doesn't work for people in hot climates like me - I tried. Had to stick a peltier in the middle - which was fun :)
Roller, you mean Thing 200072's style doesn't work for you as well as PrintMod's design, or the general concept of blowing air over the stepper doesn't work for you?

roller
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Re: Another filament cooling mod

Post by roller » Tue Jul 15, 2014 3:03 pm

I could not get enough cooling to make a difference cooling the "outer edges" of the stepper including using some inexpensive aluminium heatsinks attached to the stepper with a good thin layer of heatsink compound. My only success was with a peltier on this side. I was only referring to 200072 type approaches when I was suggesting it wouldn't work. My conclusion was attacking the heat problem form this side was "the hard way".

I think attacking the gear side with cooling like printmo (or Drew) has done is the most effective way to go... at least based on my experiments.

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JuliaDee
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Re: Another filament cooling mod

Post by JuliaDee » Tue Jul 15, 2014 4:15 pm

But Printmo's design also puts a fan on the back end of the stepper - it's the same as 200072 in principle, as far as I can tell. I'm not sure what Printmo's big intake scoop on the extruder fan is supposed to do.

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printmo
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Re: Another filament cooling mod

Post by printmo » Wed Jul 16, 2014 6:53 pm

Yes that's right I'm cooling the stepper as well. I discovered this design after I published my design. A problem with Thing 200072 might be that there is not enough airflow around the motor, the vent holes look pretty small and there is only a small air path around the motor itself. You basically have two parameters to deal with the power (airflow) of your fan and the ambient temperatures. My combination, which worked fine for me, is a 12 m^3/h (7 CFM) fan tested up to 27° C (82° F) ambient. With higher ambient temperatures you might need a more powerful fan. But this is limited as well for people running the printer in a super hot environment PLA might need more mods like roller had to.

@Julia: I designed the "scoop" a few month ago, it is not related to this mod in particular but maybe both need to be applied to work flawless with PLA. The scoop (or duct) should prevent a hot air circulation on the intake fan with exhaust air and hot air rising up from the heated build platform. With the duct installed the fan can suck in cooler air from the environment.

D3rax
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Re: Another filament cooling mod

Post by D3rax » Thu Jul 17, 2014 10:51 am

printmo wrote: A problem with Thing 200072 might be that there is not enough airflow around the motor, the vent holes look pretty small and there is only a small air path around the motor itself.
You got a point there...I think I'm going to try your design, but I only want to use the 'inner' part that shells the stepper motor and directly connect the fan to that inner part. You think this will hold? I also have 3 small ram heatsinks on the back of my stepper motor (http://www.dx.com/p/ave-x3-ram-heatsink ... 8eqtJR_v6k), I hope there is enough clearance between the fan and the heatsinks (they are about 0.8 cm high).

I'm going to test it later this week. If it doesn't fit, are you willing to make a modified stl or send me a file that I can change myself?
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printmo
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Re: Another filament cooling mod

Post by printmo » Thu Jul 17, 2014 8:50 pm

Heat sinks on the back of the stepper won't work very limited space, try to put them on the side, the back is only a bearing shield, the main heat source is the sheet metal stack (painted black) because of the iron losses. With heat sinks on the sides (approx. 5 mm space) you can try to fix the inner part in place or use the cables of the fan, without fixation it may fall off during a print. Mb20music made a remix, maybe you should contact him: http://www.thingiverse.com/thing:397270. If you are familiar with Cubify Designer / Alibre CAD then feel free to contact me for parts.

D3rax
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Re: Another filament cooling mod

Post by D3rax » Fri Jul 18, 2014 7:38 am

Okay so after all I printed http://www.thingiverse.com/thing:200072 from Dogbert, because it was designed to be friction fitted and with a heatsink on the back. I must say the cooler fits perfectly, it won't fall of during print.

After I get a fan and have hooked it up I'll do some testing hopefully this weekend (it will hot here so it would be a good 'stress' test). I do agree on you that heatsinks on the sides would be more effective so if this does not work good enough I have some improvements in mind to make to Dogbert's cooler, which might be helpful.
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D3rax
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Re: Another filament cooling mod

Post by D3rax » Wed Jul 23, 2014 9:27 am

Well I tested Dogberts design, but it did not work for me. Still a skipping steppermotor after about 15-30 minutes. I did notice that after an hour printing the stepper motor is way cooler than without the mod. It is still warm but not really hot. But I guess the motor is still to warm for my formfutura premium PLA.
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mb20music
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Re: Another filament cooling mod

Post by mb20music » Wed Jul 23, 2014 4:43 pm

Might want to try this http://www.thingiverse.com/thing:397270. I was inspired by the mod by "printmo", I used one of the .stl files he posted on Thingiverse and modified it slightly. Thanks again printmo for uploading the file!



It has been working quite well for me. I have found that it is keeping the stepper motor around 50 degrees cooler.


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D3rax
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Re: Another filament cooling mod

Post by D3rax » Thu Jul 24, 2014 6:23 am

Could try it, but its basically the same mod as I'm using now.....

One thing I'm very interesting in though is how you have used the power outlet on the back of the printer. I had this idea a while ago http://www.pp3dp.com/forum/viewtopic.php?f=18&t=4979. Can you put some details on how to set this up?
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JuliaDee
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Re: Another filament cooling mod

Post by JuliaDee » Thu Jul 24, 2014 10:38 am

I think it is easier to get 12V for a fan from the connectors on top of the print head than to use the 20V from the back of the printer. There is plenty of power available on the 12V.

roller
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Re: Another filament cooling mod

Post by roller » Thu Jul 24, 2014 2:00 pm

mb20music wrote:Might want to try this http://www.thingiverse.com/thing:397270. I was inspired by the mod by "printmo", I used one of the .stl files he posted on Thingiverse and modified it slightly. Thanks again printmo for uploading the file!

It has been working quite well for me. I have found that it is keeping the stepper motor around 50 degrees cooler.
What's your ambient temp in the room and how long are printing on this mod. I found the stepper temp easy to hold down initially but once the gradient climbed I could not get the heat away fast enough. 90min prints were ok but after two hours I still ended up over temp. But my ambient temp was also usually 25C degrees.

mb20music
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Re: Another filament cooling mod

Post by mb20music » Thu Jul 24, 2014 6:44 pm

D3rax wrote:Could try it, but its basically the same mod as I'm using now.....

One thing I'm very interesting in though is how you have used the power outlet on the back of the printer. I had this idea a while ago http://www.pp3dp.com/forum/viewtopic.php?f=18&t=4979. Can you put some details on how to set this up?
Oh, didn't realize that. nevermind then. As for the power outlet on the back of the printer, I just used an adjustable voltage step-down module purchased from eBay for around $4 and wired it into the fan wiring.

mb20music
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Re: Another filament cooling mod

Post by mb20music » Thu Jul 24, 2014 6:46 pm

JuliaDee wrote:I think it is easier to get 12V for a fan from the connectors on top of the print head than to use the 20V from the back of the printer. There is plenty of power available on the 12V.

Well, that was what I was planning to do, but I found that the 3 pin connection on the right side of the top of the print head didn't have any juice.

mb20music
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Re: Another filament cooling mod

Post by mb20music » Thu Jul 24, 2014 6:48 pm

roller wrote:
mb20music wrote:Might want to try this http://www.thingiverse.com/thing:397270. I was inspired by the mod by "printmo", I used one of the .stl files he posted on Thingiverse and modified it slightly. Thanks again printmo for uploading the file!

It has been working quite well for me. I have found that it is keeping the stepper motor around 50 degrees cooler.
What's your ambient temp in the room and how long are printing on this mod. I found the stepper temp easy to hold down initially but once the gradient climbed I could not get the heat away fast enough. 90min prints were ok but after two hours I still ended up over temp. But my ambient temp was also usually 25C degrees.
Well the ambient temperature is around 75F degrees. I however haven't tried any prints longer than an hour or so. I will have to attempt a long print.

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printmo
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Re: Another filament cooling mod

Post by printmo » Thu Jul 24, 2014 7:06 pm

mb20music wrote:
JuliaDee wrote:I think it is easier to get 12V for a fan from the connectors on top of the print head than to use the 20V from the back of the printer. There is plenty of power available on the 12V.

Well, that was what I was planning to do, but I found that the 3 pin connection on the right side of the top of the print head didn't have any juice.
Maybe both fans on the same connector?

D3rax
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Re: Another filament cooling mod

Post by D3rax » Fri Jul 25, 2014 6:29 am

@mb2music, which one of these would you recommend for a step-down regulator? http://www.dx.com/s/voltage+step-down
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