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Forget everything you know about 3D printing – the ‘replicator’ is here

nature.com

21–30 of 56 posts

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#21
If I understand this correctly, there's nothing to stop them from...

* rotating the projector instead of the tube to reduce distortion from resin movement (like in a CT scanner)

* speeding this up, using higher energies to compensate

* using multiple projectors at e.g. 90degree angles, to reduce time (and thus probably distortions through movement in the resin)

* using other wavelengths with e.g. more energy, or just better absorption properties for the resin

or are there any obvious problems with that?

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#22
These resin printers have been around for a decade. Multiple kickstarters, several commercial models on sale right now.

To classify as a ‘replicator’ it needs to be able to mix different materials (metal, plastic) seamlessly in one print as to be able to replicate itself. Not there yet...

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#23
post #2

While you end up with an acrylic model, this should be suitable for lost-wax style casting. Being able to create an unpixilated identical or scaled copy of a model will be fantastic for fine art sculpture (or destroy the industry, if copies become too easy to make). Just take your acrylic model, attach casting channels, cover in ceramic, dry, pour in your bronze, cool, crack, trim, patina, ship. Avoid all of the fidd…

> or destroy the industry

I don't think the fine art sculpture 'industry' is affected at all by the ease of making copies.

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#24

These resin printers have been around for a decade. Multiple kickstarters, several commercial models on sale right now. To classify as a ‘replicator’ it needs to be able to mix different materials (metal, plastic) seamlessly in one print as to be able to replicate itself. Not there yet...

My thoughts. I remember Autodesk made a resin print of the Eiffel Tower and some other object with plastic polymers catalyzed by light about 4 years ago, there is a video on Youtube of it somewhere.

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#25

These resin printers have been around for a decade. Multiple kickstarters, several commercial models on sale right now. To classify as a ‘replicator’ it needs to be able to mix different materials (metal, plastic) seamlessly in one print as to be able to replicate itself. Not there yet...

This is not a traditional resin printer like the Form One.

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#26
post #13

Uh, that's a standard resin printer. Except horizontal plus rotation instead of vertical. Trades angular resolution for vertical. Yes, they can be fast. They should fix their headlines.

Could multiple projectors (at e.g., 120 or 90 degree angles) be used to speed the process further?

Yes.

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#27

Uh, that's a standard resin printer. Except horizontal plus rotation instead of vertical. Trades angular resolution for vertical. Yes, they can be fast. They should fix their headlines.

No it isn't. A normal SLA printer like a Form One prints a slice at a time and crucially it doesn't "print" in the middle of the liquid - only at the surface.

This works as the article says, like a CT scanner in reverse. The resin solidifies all at once in the middle. It's very different.

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#28
post #4

The speed is amazing but the amount of waste seems rather large as they most likely can't (re)use resin that has already absorbed (an unknown amount of) light before.

It doesn't work like that. It's like a match: put enough energy in, and it transitions to a new state. Put less than the activation energy in, and it doesn't. The energy you've put in will be lost as heat, but the resin is unchanged until it changes completely.

That can't be true, because then you would have to project light from lots of different angles into the resin all at the same time, rather than from one angle with rotation like they do here.

Re: Forget everything you know about 3D printing – the ‘replicator’ is here

#29
steriolithography[1] is neat, and i think older than deposition style printers.

This is kinda wacky. Rather than a conceptually simple layer by layer approach, this has this funky convolution. they're getting it for free with the simple rotation. You can kinda see how bulbous that airplane model is, because some finer details get 'overexposed'. i bet, if they could rotate 10x around 1 axis and 1x around another axis, that tumble would sharpen up some of those edges, since you wouldn't be baking the same adjacent space so much.

Think about a 6 sided pencil. if you just rotate around the main axis, it's probably going to look pretty round without the crisp hexagon sides. but if you can also rotate around a minor axis, you could also project just the hexagon shape for a while and still preserve the cone of the tip of the pencil since most of the solidification came from the sides.

There's an opportunity for deep optimization there. Seems tricky. but pretty cool.

it's almost like pca. what projection (or series of projections) maximize hitting the target, and minimize the overbaking, all while taking into account the characteristics of the resin. maybe you can let it cool for a bit, and have more freedom to expose without hardening.

also, not a replicator. this is just one _fabulously special_ super material you mess with, not metal and plastic and cloth and fur and chitin and whatever.

[1] https://en.wikipedia.org/wiki/Stereolithography

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