Comments on RepRap: Blog: Faster, Cheaper, Better

I'm thinking R. B. Fuller & Aerogels..

2006-11-29T17:13:29.190Z

I'm thinking R. B. Fuller & Aerogels..

The idea of progressively finer resolution towards...

2006-11-29T15:32:34.113Z

The idea of progressively finer resolution towards the surface makes it sound like some kind of fractal approach might be what we should be thinking of.

I also think this is very interesting. Finer deco...

2006-11-29T04:39:22.620Z

I also think this is very interesting. Finer decomposition towards the surface is very promising, and so is embeding assorted strengthening structures inside volumes. Like if you had a hole through the cube, (for a pivot say) or wanted it to be stronger on one face than on the others.

***it takes AoI a hellishly long time to manipulat...

2006-11-29T03:21:58.673Z

***it takes AoI a hellishly long time to manipulate the resulting objects.***

ROTFLMAO! Why am I not surprised?

I really do want a copy of that script when you have it tamed down a little bit. I've got a dual Xenon workstation, so I'm not completely intimidated by the hellishly long time issue. Even if it does it will be well worth the trouble.

BTW, is it only working for cubes or for any bounded solid?

plaas: yes, that's the idea. If you specify 1mm a...

2006-11-29T03:12:13.593Z

plaas: yes, that's the idea. If you specify 1mm as the smallest crystal size, it will become like fine honeycomb towards the outside. It recursively breaks down smaller and smaller as it goes until all the space is filled or the minimum size limit is reached. So it already does that, but the image is a bit complicated to look at, and it takes AoI a hellishly long time to manipulate the resulting objects.

That's very impressive, Simon. I've got to put tha...

2006-11-28T21:18:06.240Z

That's very impressive, Simon. I've got to put that in the presentation for LCA.

Vik :v)

If you extended the treatment a bit and did multip...

2006-11-28T19:54:14.043Z

If you extended the treatment a bit and did multiple passesto break up those solid chunks of polymer near the surface you could wind up with a honeycomb-like internal structure that was finer and finer resolution as it approached the outer surface of the object.

This is so much nicer than merely punching holes in things. :-)

That is totally cool :-))There is a standard way t...

2006-11-28T19:42:12.926Z

That is totally cool :-))

There is a standard way to decompose a cuboid into 6 tetrahedra, incidentally (or 5 if you don't care if the faces match up when you pass from one cuboid across its face to the next):

Chop the cuboid by slicing straight from a diagonal across a face to give two triangular prisms.

Chop each prism in three by drawing a diagonal plane to turn one corner into a tetrahedron, then another plane in the bit that's left to chop off another corner.

Pain in the brain. Alternatively look at the slide about 3/4 of the way through this:

from the Virginia CS Dept.

From previous reports, Adrian and Vik have been ab...

2006-11-28T18:31:56.253Z

From previous reports, Adrian and Vik have been able to make 45 degree angle overhangs completely without support material. I think what Simon has done is shown us how to make large, bulky forms using that ability without having to make them even nearly solid polymer.

This is a MAJOR breakthrough in the efforts to make RepRap more cost-effective.

One question - how would you deal with the support...

2006-11-28T18:10:33.980Z

One question - how would you deal with the support material? You'd either need a way of making the slanted surfaces without any support, or a way of emptying the material out of each compartment before sealing it.

It definitely solves the problem of how to minimiz...

2006-11-28T16:16:23.206Z

It definitely solves the problem of how to minimize materials use if you are designing a reprap that can make things much bigger than itself. That's a question that has been on my mind for decades.

Well done, Simon!

This looks very useful to me !It really makes RepR...

2006-11-28T14:52:52.253Z

This looks very useful to me !

It really makes RepRap better. As Simon said: lighter, faster, material saving or much more stable with the same material consumption. This aproach could be one step towards bionic parts. This decomposition should definitely developed further.

Okay, so it doesn't look very impressive.Wro...

2006-11-28T13:17:48.326Z

***Okay, so it doesn't look very impressive.***

Wrong! :-)

Now THAT looks SUPER useful! When can I get a copy?

Comments on RepRap: Blog: Faster, Cheaper, Better

I'm thinking R. B. Fuller & Aerogels..

The idea of progressively finer resolution towards...

I also think this is very interesting. Finer deco...

***it takes AoI a hellishly long time to manipulat...

plaas: yes, that's the idea. If you specify 1mm a...

That's very impressive, Simon. I've got to put tha...

If you extended the treatment a bit and did multip...

That is totally cool :-))There is a standard way t...

From previous reports, Adrian and Vik have been ab...

One question - how would you deal with the support...

It definitely solves the problem of how to minimiz...

This looks very useful to me !It really makes RepR...

***Okay, so it doesn't look very impressive.***Wro...

Okay, so it doesn't look very impressive.Wro...