Corner roll up?
Posted by GeckospotNixie
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Corner roll up? December 23, 2013 11:35PM |
Registered: 10 years ago Posts: 8 |
Ok the problems that I’m fighting are the corners roll up.
I have tried all the thing that I can think of so it is time to ask all of you.
If you look at photo Clip1 and Clip2 you can see the back corner is rolling up.
And the final print is in Clip3.
More photo of the issue
It is really hard to see in these photos of Base1 and 2 but the lower arc rolled up.
In the final Base3 and 4 of the part you can see the bottom arc is not there at all.
This is happing at any speed slow or faster.
At this time I don’t have a fan would this help this problem?
I know this is not much info so any questions are welcome.
And any thought that you guys have I will give a shot.
Thanks GeckospotNixie
I have tried all the thing that I can think of so it is time to ask all of you.
If you look at photo Clip1 and Clip2 you can see the back corner is rolling up.
And the final print is in Clip3.
More photo of the issue
It is really hard to see in these photos of Base1 and 2 but the lower arc rolled up.
In the final Base3 and 4 of the part you can see the bottom arc is not there at all.
This is happing at any speed slow or faster.
At this time I don’t have a fan would this help this problem?
I know this is not much info so any questions are welcome.
And any thought that you guys have I will give a shot.
Thanks GeckospotNixie
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Re: Corner roll up? December 24, 2013 02:51AM |
Registered: 10 years ago Posts: 11 |
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Re: Corner roll up? December 24, 2013 05:08AM |
Registered: 11 years ago Posts: 544 |
Basically whats happening is the new layer of plastic that's being laid down is hot and expanded, the top of the new layer cools faster than the bottom, because the bottom is insulated by the previous layer, and the top is being cooled by the air. This causes top to cool and contract, curling the edges upwards and ruining your print. There are two ways to solve this, use a fan to blow on the plastic as it comes out and cool it evenly, or use a heated build environment, which will give you zero warp and higher part strength. I recently printed some very large parts on my printer, 12"x12" in area and it delaminated mid print because of this curling effect. The print sheared in half, a 12x12" 5mm thick circle.
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Re: Corner roll up? December 24, 2013 05:38AM |
Registered: 10 years ago Posts: 273 |
Is your printer in a drafty cold environment like a garage or shed ?
If so try to eliminate the drafts. One thing I did for a while was put an old bed sheet over my machine, and it really helped.
However one thing to be aware of was that my motors got a lot warmer when I had a sheet over the machine.
Another issue I had was the fan on the extruder blowing down onto the model as it was printed. I had to use Kapton tape to make a sort of duct to prevent the air from the fan going downwards
If so try to eliminate the drafts. One thing I did for a while was put an old bed sheet over my machine, and it really helped.
However one thing to be aware of was that my motors got a lot warmer when I had a sheet over the machine.
Another issue I had was the fan on the extruder blowing down onto the model as it was printed. I had to use Kapton tape to make a sort of duct to prevent the air from the fan going downwards
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Re: Corner roll up? December 24, 2013 09:47AM |
Registered: 10 years ago Posts: 8 |
Thanks for all the input and help guys.
I now have some time so here is more information for all.
I'm using ABS with the extruder temp of 225c and have a heated bed running at 90c.
And this is what I'm getting.
So is the bed to hot or not hot enough?
It is sounding to me the only way out of the issue is to use a fan.
GeckospotNixie
I now have some time so here is more information for all.
I'm using ABS with the extruder temp of 225c and have a heated bed running at 90c.
And this is what I'm getting.
So is the bed to hot or not hot enough?
It is sounding to me the only way out of the issue is to use a fan.
GeckospotNixie
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Re: Corner roll up? December 24, 2013 10:04AM |
Registered: 12 years ago Posts: 809 |
You need to maintain a higher build envelope temperature.
- akhlut
Just remember - Iterate, Iterate, Iterate!
[myhomelessmind.blogspot.com]
- akhlut
Just remember - Iterate, Iterate, Iterate!
[myhomelessmind.blogspot.com]
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Re: Corner roll up? December 24, 2013 11:32AM |
Registered: 10 years ago Posts: 1,381 |
Turkey bag-enclosure
Barring faulty wiring connections, and software glitches,
I think akhlut is correct in suggesting that the ambient air temperature
needs to be placed under your control.
Place your printer inside of a large "oven bag",
or drape a large sheet of the oven bag over your printer, and seal the edges.
Glass transition temperature of ABS is approximately 105°C (221 °F).
Warm the interior of your turkey bag-enclosure to some thing below 105°C (221°F).
Your substrate should be the same temperature as the enclosure temperature.
Your substrate temperature of 90°C is a good place to start experimenting.
Barring faulty wiring connections, and software glitches,
I think akhlut is correct in suggesting that the ambient air temperature
needs to be placed under your control.
Place your printer inside of a large "oven bag",
or drape a large sheet of the oven bag over your printer, and seal the edges.
Glass transition temperature of ABS is approximately 105°C (221 °F).
Warm the interior of your turkey bag-enclosure to some thing below 105°C (221°F).
Your substrate should be the same temperature as the enclosure temperature.
Your substrate temperature of 90°C is a good place to start experimenting.
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