self folding 3d prints

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ekaggrat singh kalsi

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Apr 18, 2019, 1:47:36 AM4/18/19
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Ryan Carlyle

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Apr 18, 2019, 9:20:36 PM4/18/19
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Clever!

I think you’d want nylon or another material that strain-crystallizes and then anneals. If you print a really fast layer of nylon and then a really slow layer of nylon, and heat it up to the creep temp, it should self-fold like this as the faster-printed nylon relaxes to a less strained (ie shorter along the strand) state.

Whosawhatsis

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Apr 18, 2019, 9:31:12 PM4/18/19
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You should also see some effect from narrow extrusions with a smaller cross-section than the nozzle, essentially being drawn out under tension, vs. plastic extruded with a larger cross-section than the nozzle being compressed into that space. You could vary both the layer height and extrusion width, in addition to speed, to achieve this effect.

On April 18, 2019 at 18:20:38, Ryan Carlyle (temp...@gmail.com) wrote:

Clever!

I think you’d want nylon or another material that strain-crystallizes and then anneals. If you print a really fast layer of nylon and then a really slow layer of nylon, and heat it up to the creep temp, it should self-fold like this as the faster-printed nylon relaxes to a less strained (ie shorter along the strand) state.

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Ryan Carlyle

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Apr 18, 2019, 10:09:32 PM4/18/19
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Yes, anything that draws it out should work. Thinner strands than your nozzle orifice, fast feedrate at low layer height, etc.

Curious how hard it would be to build a Cura plugin to do this. Probably a lot of variables to optimize. 


On Thursday, April 18, 2019 at 8:31:12 PM UTC-5, Whosawhatsis wrote:
You should also see some effect from narrow extrusions with a smaller cross-section than the nozzle, essentially being drawn out under tension, vs. plastic extruded with a larger cross-section than the nozzle being compressed into that space. You could vary both the layer height and extrusion width, in addition to speed, to achieve this effect.

On April 18, 2019 at 18:20:38, Ryan Carlyle (temp...@gmail.com) wrote:

Clever!

I think you’d want nylon or another material that strain-crystallizes and then anneals. If you print a really fast layer of nylon and then a really slow layer of nylon, and heat it up to the creep temp, it should self-fold like this as the faster-printed nylon relaxes to a less strained (ie shorter along the strand) state.

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Whosawhatsis

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Apr 18, 2019, 10:11:32 PM4/18/19
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Well, Cura already has separate settings for the speed, height, and extrusion width of the first layer. If you print something with only two or three layers (it would have to be thin anyway), that should be enough to allow you to test the concept.
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tray

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Apr 19, 2019, 7:13:38 AM4/19/19
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The first layer also goes down on a giant heat sink, which changes that layer's thermal profile considerably.


On Thursday, April 18, 2019 at 10:11:32 PM UTC-4, Whosawhatsis wrote:
Well, Cura already has separate settings for the speed, height, and extrusion width of the first layer. If you print something with only two or three layers (it would have to be thin anyway), that should be enough to allow you to test the concept.

On April 18, 2019 at 19:09:33, Ryan Carlyle (temp...@gmail.com) wrote:

Yes, anything that draws it out should work. Thinner strands than your nozzle orifice, fast feedrate at low layer height, etc.

Curious how hard it would be to build a Cura plugin to do this. Probably a lot of variables to optimize. 

On Thursday, April 18, 2019 at 8:31:12 PM UTC-5, Whosawhatsis wrote:
You should also see some effect from narrow extrusions with a smaller cross-section than the nozzle, essentially being drawn out under tension, vs. plastic extruded with a larger cross-section than the nozzle being compressed into that space. You could vary both the layer height and extrusion width, in addition to speed, to achieve this effect.

On April 18, 2019 at 18:20:38, Ryan Carlyle (temp...@gmail.com) wrote:

Clever!

I think you’d want nylon or another material that strain-crystallizes and then anneals. If you print a really fast layer of nylon and then a really slow layer of nylon, and heat it up to the creep temp, it should self-fold like this as the faster-printed nylon relaxes to a less strained (ie shorter along the strand) state.

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