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Extruder cooling
Posted by Fizpok
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Extruder cooling April 16, 2015 12:33PM |
Registered: 9 years ago Posts: 120 |
Hi,
I am going to use one of those:
[ru.aliexpress.com]
I am going to use fan directed to the plastic part to prevent the heat to spread up from the hot end. I did it with the full-metal extruder, but...
Could someone tell me, does it have any sense with the plastic body? I mean, it is not supposed to transfer heat, so will I be able to cool it?
To repeat: I am not talking about cooling the printed area, I need to prevent heat from spreading up, as otherwise the filament stucks.
Thank you.
I am going to use one of those:
[ru.aliexpress.com]
I am going to use fan directed to the plastic part to prevent the heat to spread up from the hot end. I did it with the full-metal extruder, but...
Could someone tell me, does it have any sense with the plastic body? I mean, it is not supposed to transfer heat, so will I be able to cool it?
To repeat: I am not talking about cooling the printed area, I need to prevent heat from spreading up, as otherwise the filament stucks.
Thank you.
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Re: Extruder cooling April 16, 2015 01:11PM |
Registered: 9 years ago Posts: 156 |
I think a fan does help to keep the cold end cold even though it is plastic. Try to get a good fan with decent CFM rating.
You might want to read this article comparing J-head hot ends (thanks Steve for linking this in your Instructable).
[jheadnozzle.blogspot.ca]
It describes the potential problems with using J-head clones. Based on the fact that it has only 4 cooling fins, it looks like the one you are considering buying is a clone.
You might want to read this article comparing J-head hot ends (thanks Steve for linking this in your Instructable).
[jheadnozzle.blogspot.ca]
It describes the potential problems with using J-head clones. Based on the fact that it has only 4 cooling fins, it looks like the one you are considering buying is a clone.
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Re: Extruder cooling April 16, 2015 01:19PM |
Registered: 10 years ago Posts: 1,401 |
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Re: Extruder cooling April 16, 2015 04:09PM |
Registered: 9 years ago Posts: 286 |
I used a cheap j-head clone like this before i got my hexagon. I got the hexagon for higher temp materials.
It printed pla and abs perfectly well but i did need to have a fan pointed at the black body for best results especially on long prints.
And remember to remove ghe kapton tape from the body.
The tape should only be on the heater block.
Gordon
It printed pla and abs perfectly well but i did need to have a fan pointed at the black body for best results especially on long prints.
And remember to remove ghe kapton tape from the body.
The tape should only be on the heater block.
Gordon
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Re: Extruder cooling April 16, 2015 07:31PM |
Registered: 9 years ago Posts: 109 |
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Re: Extruder cooling April 17, 2015 04:14AM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 07:25AM |
Registered: 9 years ago Posts: 286 |
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Re: Extruder cooling April 17, 2015 07:48AM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 07:49AM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 08:22AM |
Registered: 9 years ago Posts: 286 |
250c is very high for abs and too high for pla.
I went for the all metal hexagon ready for higher temp materials but havnt looked at thermocouples yet to replace the thermistor.
The higest i go with abs is 235c so within j-head ranges.
The nylon ive started using prints at 240c but i need to experiment a bit more and head up to 250c.
Taulman bridge nylon which is one of the easier nylons to print.
The hexagon can handle that without problem but i need to look closer at the thermistor and maybe take ghe plunge on a thermocouple.
Gordon
I went for the all metal hexagon ready for higher temp materials but havnt looked at thermocouples yet to replace the thermistor.
The higest i go with abs is 235c so within j-head ranges.
The nylon ive started using prints at 240c but i need to experiment a bit more and head up to 250c.
Taulman bridge nylon which is one of the easier nylons to print.
The hexagon can handle that without problem but i need to look closer at the thermistor and maybe take ghe plunge on a thermocouple.
Gordon
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Re: Extruder cooling April 17, 2015 09:51AM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 10:44AM |
Registered: 10 years ago Posts: 1,401 |
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Re: Extruder cooling April 17, 2015 11:44AM |
Admin Registered: 17 years ago Posts: 7,879 |
J-heads are fine at 250C. I run mine at that temperature all day long, day in day out. That is assuming your temperature measurement is spot on and your PID doesn't have massive overshoot.
[www.hydraraptor.blogspot.com]
[www.hydraraptor.blogspot.com]
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Re: Extruder cooling April 17, 2015 11:48AM |
Registered: 9 years ago Posts: 120 |
Thanks.
One more question. For this one (they have English description somewhere, which is not a description, frankly):
[ru.aliexpress.com]
I need to select a termistor in Sprinter's termistor table. How can I figure out what they use?
One more question. For this one (they have English description somewhere, which is not a description, frankly):
[ru.aliexpress.com]
I need to select a termistor in Sprinter's termistor table. How can I figure out what they use?
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Re: Extruder cooling April 17, 2015 12:54PM |
Registered: 9 years ago Posts: 752 |
Seems like that one you link to is a bowden version. Make sure that you order the correct one.
You could try taking the thermistor out and find any markings on it to know what thermistor setting you'll need. You could also try contacting the seller.
As for thermistor, I'd use a multimeter with thermocouple to check what the temperature gradient is every 10 degrees C. Either create a new profile for the firmware or use a table that is close to what you measured.
You could try taking the thermistor out and find any markings on it to know what thermistor setting you'll need. You could also try contacting the seller.
As for thermistor, I'd use a multimeter with thermocouple to check what the temperature gradient is every 10 degrees C. Either create a new profile for the firmware or use a table that is close to what you measured.
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Re: Extruder cooling April 17, 2015 02:23PM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 02:39PM |
Registered: 9 years ago Posts: 569 |
There are two ways to connect your extruder to the hotend, direct connection or bowden tube. With a bowden tube, your extruder is generally mounted to the frame of the printer, and a 12-18" segment of PTFE tube is connected between the extruder and the hotend, typically with push-fit compression fittings. Imqqmi is suggesting you linked a bowden hotend but are actually referring to a direct connect hotend. Though I just skimmed most of the posts.
However, why not look at the new E3D v6Lite instead of a J-head clone? I think it is only $10 dollars more and should already come with a hotend fan and cowl, with the same printing range as the cloned J-head. Plus, down the road, it should be possible to upgrade the hotend to a full v6, capable of 300 degree temperatures. Just a thought.
However, why not look at the new E3D v6Lite instead of a J-head clone? I think it is only $10 dollars more and should already come with a hotend fan and cowl, with the same printing range as the cloned J-head. Plus, down the road, it should be possible to upgrade the hotend to a full v6, capable of 300 degree temperatures. Just a thought.
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Re: Extruder cooling April 17, 2015 02:47PM |
Registered: 9 years ago Posts: 120 |
Err... One more question. I have 1.75mm Wade's Accessible.
43/10 in terms of gears.
Now, according to
[reprap.org]
steps should be
// Gregstruder with a 43:10 gear ratio
(200 * 16) * (43 / 10) / (7 * 3.14159) = 625.70681
(Gregstruder? But gears are right.)
I have all 3 jumpers set for the extruder's shield.
However, according to calibration (extrude 100 mm), I got 930 - HOW?!
43/10 in terms of gears.
Now, according to
[reprap.org]
steps should be
// Gregstruder with a 43:10 gear ratio
(200 * 16) * (43 / 10) / (7 * 3.14159) = 625.70681
(Gregstruder? But gears are right.)
I have all 3 jumpers set for the extruder's shield.
However, according to calibration (extrude 100 mm), I got 930 - HOW?!
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Re: Extruder cooling April 17, 2015 02:48PM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 02:56PM |
Registered: 9 years ago Posts: 569 |
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Re: Extruder cooling April 17, 2015 03:04PM |
Registered: 9 years ago Posts: 120 |
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Re: Extruder cooling April 17, 2015 08:33PM |
Registered: 9 years ago Posts: 120 |
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