Top-down air pocket design?

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flygfarkost
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Top-down air pocket design?

Postby flygfarkost » Thu Sep 24, 2015 7:13 am

Hi everyone,

I had an idea some time ago when thinking about resin printers, please take a look at the picture and description here:

I've seen designs that use the bottom of a container in order to keep the surface of the resin flat and and at consistent height, but then there is the problem of resin sticking to the container.

Has this been done before?

SIDRANA
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Re: Top-down air pocket design?

Postby SIDRANA » Thu Sep 24, 2015 11:58 am

Hi;

Works well,

New DLP technique : The reverse flexi-vat for top-down :)
www.buildyourownsla.com/forum/viewtopic.php?f=11&t=2948


Best Regards

Saeed

mekada
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Re: Top-down air pocket design?

Postby mekada » Thu Sep 24, 2015 1:18 pm

Sidrana,
look at the sketch again. This is not a Reverse-Flex vat but an air cushion, which means no adhesion & peeling.
The big question is whether adding pressure in the cushion gives a more reliable layer height than just atmospheric pressure.

seasicksinbad
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Re: Top-down air pocket design?

Postby seasicksinbad » Thu Sep 24, 2015 11:23 pm

Great idea! Then you can fill the pocket with low pressure oxygen and create a dead zone, made of resin that won't harden when exposed to UV light, focus your beam right under the surface and you'll have a continuous printing machine.
Time flies like an arrow, fruit flies like a banana.

flygfarkost
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Re: Top-down air pocket design?

Postby flygfarkost » Fri Sep 25, 2015 4:31 am


seasicksinbad
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Re: Top-down air pocket design?

Postby seasicksinbad » Fri Sep 25, 2015 10:10 pm

I have been printing on my top down successfully for quite a while now, I use a tensioned diaphragm to prevent menisci from forming and it works great.
I see potential on your design. There are a few things to consider, like maintaining a constant pocket pressure control to avoid changes on resin level.
I wonder what effect would have using the pressure inside the pocket to replicate the dipping of the printing platform by varying the pressure inside the chamber in order to raise and lower the level of resin.
Time flies like an arrow, fruit flies like a banana.

flygfarkost
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Re: Top-down air pocket design?

Postby flygfarkost » Sat Sep 26, 2015 6:18 pm


seasicksinbad
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Re: Top-down air pocket design?

Postby seasicksinbad » Sat Sep 26, 2015 9:33 pm

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Time flies like an arrow, fruit flies like a banana.

flygfarkost
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Re: Top-down air pocket design?

Postby flygfarkost » Sun Sep 27, 2015 6:20 am



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