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Why aren't there more coolers like the CrownCooler? (circular/ring cooling duct instead of from only left and right)


Tye

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Repo for the CrownCooler is here: https://github.com/sneakytreesnake/CrownCooler

I used to use a similar, less refined, ring cooler years ago when I was modding Ender 3s and got great results. I'm surprised that we, the Voron collective, haven't adopted more of this style. 

Is there some fundamental reason they're not more popular? I've been thinking about testing my design skills in a tool head assembly and the ring cooler idea seems so promising. But am I missing something that makes that a bad idea?

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I didn't use a crown cooler for now but I could think that the air flow on this one is hard to get equal out of every position of the duct.

From the reach side most of them have one inlet, that makes it hard to have the same pressure on every spot. In fusion you can simulate flow direction and I did try a few and all ways in small ducts like you need them in 3d systems you need to put immense power in it to cool.

 

Yes crown cooler cool more then the similar left right version but how much airflow do you need?

 

Left right system go from 2cfm to 4/5 cfm, crown can go up to 20 and more (cpap or pressure pump systems)

To be honest I don't want to try a crown one cause I fear I will not stop till I get perfect high pressure cooling without blowing away the parts from the heatbed 🤣🤣🤣🤣🤣.

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Changing only the shape and placement of the air outlets does not cause more air to flow.   To change that, we'd need to replace the fan(s)

If the purpose is to increase cooling, because you want to print PLA very fast, then for any given fan, you want to increase the air VELOCITY over the hottest part of the print.   That would be right at the tip of the nozzle and over the plastic that was just printed some milliseconds ago.

The cooling effect of air depends mostly on the velocity of the air.     One way to make the airflow slower is to place a few outlets in a circle and aim them all inward to the center of the circle.

 For best cooling, you would have one outlet that blows in one direction with no opposed airflow.  But which direction?  You'd like to have the air flowing over the hot plastic that was just printed.   One wide air nozzle might work.

Maybe the best design for cooling would be high-velocity air moving in all directions.  Would aiming all the outlets to the center do that?   I doubt it.  I think it would be best if a "few" (2 or 3) air jets just missed each other and created a swirling vortex.

Why does velocity matter more than anything else?  Because the speed at which heat moves between objects depends on the temperature difference between the hot and cold objects.   If the air moves slowly it heats up, reduces this temperature difference, and slows the heat transfer.  So the goal is to move the air faster so it does not have time to heat up, the faster you can move it the better.

 

 

 

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According to this a 2 or 3 tip cpap cooler would be the best if you manage to get a decent high flow speed of cooling.

I'd seen some air pump cooler that use just tube outlets instead of fan ducts. Question there is : does this need a lot of tuning for finding the sweet spot to cool down the already printed material.

In my occasion I rathe go for a Xol duct system with slower printing time on pla like 150 to 160mms cause I'm a hobbiist.

High speed printing for me makes sense when you own a print farm or work something like PIF.

For material like ASA, ABS, CF infused and high temp there are other rules and that's the material I'm aiming at cause I build loads of stuff used by Cosplay, motorbike and household stuff for friend colegues and Co worker.

For cosmetic and art I would prefer to build a second printer.

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Thank you for the information. I also prefer quality over speed and technical parts. (as fast as "reasonably" possible without sacrificing quality)

I was thinking more along the lines of even cooling rather than fast cooling. Quality/even ABS cooling with an enclosed chamber as opposed to Speed Benchy PLA. The CrownCooler just happens to use CPAP and push a lot of air. So I was thinking of something like two 4010 fans, but blowing into a ring instead of two ducts.

I've noticed that many current duct systems are near the front of the tool head and blow air slightly backward. So the front, left, and right of the print get a lot of air, but the backside of the print doesn't get quite as much. Anecdotally, I've sometimes had prints whose overhangs on the backside (positive y-axis) aren't quite as good as the other overhangs. I wonder if this is due to the particular way the air blows on the print?
I've seen similar (minor) issues on the inner perimeter of larger holes.


 

 

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Yes, very likely. I've had issues with overhangs on some parts where I'm pushing the envelope on my V0. It's better (but not perfect) after swapping from the stock MiniSB to the DragonBurner. The big change is the fan size and duct arrangement. The back gets more air, which helps.

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