Perfactory Machine: Can we make one? Little backstory: My Sister is Friends with a Guy who owns/runs a foam shop. He uses hot wire machines to cut simple 2d foam shaped objects for his clients needs. He's built ever damn machine in that place. He is building a 3 axis machine. He knows how to work/build with the large scale stepper motors, servos, motion controllers- the works. He uses Autocad to cut his patterns out and thats all been 2d until just recently. I'm a 3d CGI artist guy. He asked my Sister to ask me if I could make him some 2d DFX files from any type of 3d model. Trying to figure out how to do this. I found out about Meshlabs. It has a slice function that saves all the slices from the 3d model as 2d profile SVG "Scalable Vector Graphic". Theres another program out there called "POV-Ray" which might do a better job with this. It was used to do the same thing on a homemade sugar/heat based Rapid Prototype machine from the Evil Mad Scientist LAbs. That would probably be the better program to seek out if this Garage Perfacto Machine is possible. Initially He was just going to wire cut out a few slices made from these 3d models and glue them all together to make the part, but now he's doing the 3 axis route. I need to get to the point. Being exposed to all this stuff really set a fire to my backside. I really want 3d prints of my work with excellent detailing. I want an RP machine of my very own. I've seen all the machines out there and what they can provide and the Perfactory is the one thats standing on top of the mountain when it comes to Level of Detail and Speed. I make my model with 6 million polys most of the time. I want that kind of Detail! Not only that. The machine seems to be way more simpler than what you Guys are creating. It only has one Axis controlled motor on it. That motor pulls the arm with the top of the build tray up before each new layer is created. No more 3 axis needed! Most models made in the PErfacto don't even need Support Post work added to them- Thanks to the way this machine builds the model. The first layer naturally glues itself down too the Z Axis arm's roof. The roofs surface is made of simple glass. After each layer is created it rises up 25 micrometers. The next layer is built below the first layer, but somehow it is separated from the lower glass tray using a "Vacuum Diffuser Tilting Mechanism (Haven't looked that up yet- it sounds a little complex) The real money for the machine has to be in the Texas Instruments DMD chip. And maybe the Projection Bulb. The way it works is like this. The DMD Chip is a rectangular array containing millions of microscopic sized mirrors. Underneath these mirrors are tiny electrodes. Voltage sent to these electrodes cause the mirrors to tilt towards or away from the light source (projector bulb) These mirrors when tilted into the On position redirect that Projector Bulbs Light out onto the Observation Area. In this case the Observation Area is the Glass under the vat of photoactive resin. The mirrors that don't turn on, dont send any light to the observation area. Each mirro/tile represents a pixel in the image. Basically Perfactory is using this DMD chip to project a simple 2 bit Black and White colored image into the vat of photoactive resin. The White color becomes the lighted up tile/mirrors. Theres no light projected in the black area. The Black image information is ignored by those mirrors. They remain off. Only the White image information is translated into a "turn/tilt little mirror" command where that mirrors position on the chip is relative to it's position in the image. All of the white areas in this image is projected from the projector under the table through a clear piece of glass into the photoactive resin. It cures into this resin at 25 microgram depth, and this layer is cured into the exact shape of that white image/light shape information. All you need is a program like Meshlabs or POV-Ray to cut up your model into these several thousand 2d 2color scale information images. Might have to reverse black to white/white to black. since these program like to make the model information black. It's like 436 layers to make half an inch. Each layer requires 8 seconds worth of static image projection time. And then it takes 3-5 second for the Vacuum Diffuser/Tilt Mechanism to separate the model from the lower glass tray (not the top one) and then the Z axis arm goes up 25 micrograms to start the new layer. This machine sounds painfully easy to build- well not really. It will make way better models then what you guys are toying with right now. I've included an image to help you visualize it. Please tell me that it's possible to build this garage style for way less money. https://reprap.org/forum/read.php?1,14319,14319#msg-14319 Tue, 16 Jun 2026 20:59:52 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,14319,16341#msg-16341 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,16341#msg-16341
the cheapest resin I've been told for the envision perfactory standard zoom machine is a yellow colored resin, cost around $240 - $250 more or less depends where you get them I guess.
and the light bulb cost about $1500 to replace]]> 3dart General Sat, 30 Aug 2008 18:50:54 -0400 https://reprap.org/forum/read.php?1,14319,16340#msg-16340 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,16340#msg-16340
I came across this forum by chance. This seems very interesting and it would be nice to see if you guys can put it together, I'd sure would like to have one for myself!

I saw this envision standard zoom machine recently, the tray that holds the resin is made of clear silicone rubber, and the platform that the tray is sitting on looks like its hinged on 2 sides and jointed on the other 2 sides, which it can create a tilting motion so that the cured resin can pull away from the silicone tray and more resin materials can flow in underneath ready for the next layer.]]> 3dart General Sat, 30 Aug 2008 18:47:34 -0400 https://reprap.org/forum/read.php?1,14319,14746#msg-14746 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14746#msg-14746
Quote

Doensn't glass block UV-light BTW?

Yes, mostly. It seems most things do. You can mitigate the problem somewhat by doing longer exposure times or using a super-powerful light source. Some glass will of course be better than others in this regard, and you're likely to get different effect from different wavelengths of UV, but this starts to drift out of my limited area of knowledge ;)

(I briefly played with UV photography. It's tricky, practically impossible with CMOS digital camera sensors, and UV-transaprent quartz lenses are horrifyingly expensive.)]]> Ru General Tue, 22 Jul 2008 04:47:55 -0400 https://reprap.org/forum/read.php?1,14319,14745#msg-14745 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14745#msg-14745
If you used a Dia projector you could load its magasine with 24 pictures and change for each exposure with the remote control :-)

Doensn't glass block UV-light BTW?]]> mimarob General Tue, 22 Jul 2008 04:10:04 -0400 https://reprap.org/forum/read.php?1,14319,14586#msg-14586 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14586#msg-14586
I just checked the pricing for methyl methacrylate. It appears that in very large lots it is selling for about $1.25-1.50/lb these days. If you buy it from chemical supply labs, however, you can play on paying about $25/lb for it in bottles. It hasn't seen the price rises that many polymers have since it is largely produced form natural gas rather than oil.]]> Forrest Higgs General Fri, 18 Jul 2008 10:07:42 -0400 https://reprap.org/forum/read.php?1,14319,14584#msg-14584 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14584#msg-14584 -------------------------------------------------------
> Traditionally, the problem with photolithography
> type prototypes that depend on radiation in one
> form or another to polymerize monomers has been
> the cost of the monomer.

True, but one advantage of this approach is that it uses less of it than the alternatives which normally involve flooding the whole work area.]]> Douglas Brebner General Fri, 18 Jul 2008 09:28:31 -0400 https://reprap.org/forum/read.php?1,14319,14565#msg-14565 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14565#msg-14565 Forrest Higgs General Thu, 17 Jul 2008 18:12:51 -0400 https://reprap.org/forum/read.php?1,14319,14562#msg-14562 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14562#msg-14562 -------------------------------------------------------
> Are the resins for this approach available, and
> what's the ballpark cost/volume, anybody know?

[www.prototypemagazine.com]

"In terms of consumables, the first thing to consider is the material. This is priced at ]]> JohnWasser General Thu, 17 Jul 2008 18:00:03 -0400 https://reprap.org/forum/read.php?1,14319,14549#msg-14549 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14549#msg-14549 -------------------------------------------------------

> Exposing an entire layer at once (many voxells in
> parallel) is attractive, but isn't the only way to
> go. One could imagine a raster-scan system, based
> on two tilting mirrors to "paint" each layer. If
> the light source were of sufficient power, that
> approach might be competitive on speed. One can
> also imagine more than one beam -- maybe one for
> coarse features and another for the fine
> ones.....

Now we're back to "standard" UV-printing, except with the innovation of having a thin layer of monomer instead of flooding the build area. Not the end of the world, but takes about half the innovation out of the design.

> Are the resins for this approach available, and
> what's the ballpark cost/volume, anybody know?
> Ditto patent/IP status.
>
> -- Larry

Commercial resins are mega-expensive. Fernando seems to think you can do the same thing on the cheap, but he isn't there quite yet.

For patent stuff... I think it's pretty new. Considering they use a projector, it's nowhere near the 20-years-old that a patent has to be to expire. So yeah, what Forrest said.]]> Kyle Corbitt General Thu, 17 Jul 2008 16:03:19 -0400 https://reprap.org/forum/read.php?1,14319,14547#msg-14547 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14547#msg-14547
For the above "Primative but Functional" design to work, the light would have to be well collimated (parallel rays) and quite uniform. Even then, the transpariencies should be as close as possible to the resin, to minimize diffraction.

Exposing an entire layer at once (many voxells in parallel) is attractive, but isn't the only way to go. One could imagine a raster-scan system, based on two tilting mirrors to "paint" each layer. If the light source were of sufficient power, that approach might be competitive on speed. One can also imagine more than one beam -- maybe one for coarse features and another for the fine ones.....


Alternatively, the transparencies might be replaced by two plates, one with a slit (parallel to Y) that moves only in X, the second the same thing, rotated by 90 degrees. That's just another way of exposing one X, Y area at a time. (Though it does waste most of the light.)
This limits us to a single size of voxell, but uses pure translation instead of rotations (which can induce trig terms -- distortion if not accounted for.)


Are the resins for this approach available, and what's the ballpark cost/volume, anybody know? Ditto patent/IP status.

-- Larry]]> Larry_Pfeffer General Thu, 17 Jul 2008 15:26:28 -0400 https://reprap.org/forum/read.php?1,14319,14546#msg-14546 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14546#msg-14546
primitivelz2.jpg

]]> makeit General Thu, 17 Jul 2008 14:58:32 -0400 https://reprap.org/forum/read.php?1,14319,14545#msg-14545 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14545#msg-14545
Maybe those could be the answer. You could use them to make a block out shape.

The Lcos chip is another alternative.

Worst case alternative: We use a hand crank system and a plate loader.

We print our layers out on transparent overhead sheets in a standard printer. We replace the ink in the cartridge with something that has more opacity to it so the light wont shine through.

We load these 8x10 printed on transparency sheet into the plate loader.

Then we remove a cover plate covering the light source. The light goes through the printed on overhead transparency sheet under the glass table. Under the resin holding vat. We expose the resin for a certain length of time.

Place the light plate cover back over the light source again.

Hand crank our build arm up a tiny bit for the next layer.

Release more resin into the building vat.

Then we load our next image into the plate loader and we are ready to do it all over again.

It would be midevil as all hell, but it could work.

Hehehehehehe I'm just joshing with ya, but hey I might go there maybe...]]> makeit General Thu, 17 Jul 2008 14:20:03 -0400 https://reprap.org/forum/read.php?1,14319,14537#msg-14537 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14537#msg-14537 Forrest Higgs General Thu, 17 Jul 2008 12:42:05 -0400 https://reprap.org/forum/read.php?1,14319,14536#msg-14536 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14536#msg-14536 makeit General Thu, 17 Jul 2008 12:36:22 -0400 https://reprap.org/forum/read.php?1,14319,14535#msg-14535 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14535#msg-14535 www.viewsonic.com]


[www.superwarehouse.com]



Saw an even cheaper price but not sure if it's the same unit.]]> makeit General Thu, 17 Jul 2008 12:32:41 -0400 https://reprap.org/forum/read.php?1,14319,14528#msg-14528 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14528#msg-14528 Well this is just a little over what is suitable for a 600US$ limit isn't it? ;)

makeit, I'd love to see the projectors you mentioned.
I looked around and most consumergrade projectors do have some sort of lcd/tft solution, or just tubes like a crt.
I don't find anything that has a dmd chip installed.

even the highest priced model I could find right now (Epson EMP-8300NL) has nothing but a small (1.4") tft inside

'sid

[EDIT]
Never mind, I've found some...]]> sid General Thu, 17 Jul 2008 11:43:44 -0400 https://reprap.org/forum/read.php?1,14319,14526#msg-14526 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14526#msg-14526 www.pixelprecision.net]

[www.pixelprecision.net]

Supports bitmap and jpeg image importing. Don't see why anyone would want to use the pixel by pixel image creation suite they offer. Program allows the creation of animation files as well- that would have solved the timing routine. Image shape for certain number of frames. Then blank image to turn of mirrors for certain number of frames.

But even this way and how you generate all that seems like a big P.I.A! Too much mula for what it does and it sounds like a slow painful way to do a simple batch process!


You should be able to drag or import a folder with the all image files in it created in the native resolution that the chip display in (pov-ray slice feature) if need be they can be batch files dragged into paintshop to reduce them to 2 bit black and white images before you do this. Very fast and done like that.

So you import or drag the folder with these already scaled to match mirror resolution files into the build/task window. A window pops up and ask if you want to insert a blank image between each image file sent (blank image is the turn off mirror command) You click yes. Time for each frame button comes up or is selectable

You enter in the time value you need to work with whatever time corresponds with the arm and cure rate. Something like that.]]> makeit General Thu, 17 Jul 2008 11:22:52 -0400 https://reprap.org/forum/read.php?1,14319,14524#msg-14524 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14524#msg-14524 makeit General Thu, 17 Jul 2008 11:04:15 -0400 https://reprap.org/forum/read.php?1,14319,14523#msg-14523 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14523#msg-14523
[www.dlinnovations.com]



They asked what resolution and wavelength -

UV cost more.


10,000 dollars for the starter kit at 1280x1024 resolution using regular projector bulb. Ummmmm....

It does however come with everything needed to control the chip- not sure if the light source/bulb is included in this price. The UV version at this resolution is much more $. I didn't have it in me to ask.

The Pixel Percision software that will control the boards they offer cost 3,500 dollars. Ouch!

They have a deadline coming up the 1100 going End of Life Soon. Told me I'd have to sign a license agreement and all sorts of stuff. WTH?!?!?!?

Wow :( back to square one again. I guess this means moding a used or broken DLP model now.
]]> makeit General Thu, 17 Jul 2008 11:01:32 -0400 https://reprap.org/forum/read.php?1,14319,14518#msg-14518 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14518#msg-14518 Kyle Corbitt General Thu, 17 Jul 2008 10:24:26 -0400 https://reprap.org/forum/read.php?1,14319,14508#msg-14508 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14508#msg-14508 [forums.reprap.org]
I think there's only the machine left ;)

'sid]]> sid General Thu, 17 Jul 2008 06:25:05 -0400 https://reprap.org/forum/read.php?1,14319,14489#msg-14489 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14489#msg-14489 Kyle Corbitt General Wed, 16 Jul 2008 19:25:58 -0400 https://reprap.org/forum/read.php?1,14319,14483#msg-14483 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14483#msg-14483
Heres an image to better explain whats going on with the DMD chip.




It's not just projecting an image. It's projecting it as a shape of pure light. This shape is caused by the pixel value that those mirrors on the chip are told to represent and ignore.

The cost wont be too bad if you buy a used or broken 1 chip DLP projector on Ebay. These projectors already have the power supply unit, the DMI cable connector, the lens and the bulb holder, a working bulb if your lucky.

So The Controlboard and maybe the DMD chip is all you'll have to swap out if you go that route. We sorta don't want to use the preinstalled DMD chip and controlboard= Since they will vary from all the available projector models.

We want to install our own, unless this issue of controlling the ones inside are all the same no matter which projector you buy so long as it's from the same company and has the same pixel display resolution.

The program we create will most likely be much easier to make if it's based on the same chip with a fixed resolution and controlboard that comes form the same manufacturer.

You can't promise other builders theyre build will work, if you tell them to hunt down a used projector since these 2 critical parts may vary.

Maybe we can replace the projection bulb with an ultra bright LED. Improving it's lifecycle and reducing the need to constantly readjust it from the effect caused by the burn off effect.


This is a Mod Project. How bad and involved that Modwork is remains unknown right now.

Theres a software program out there already to control the DMD chip and the Controlboard from that Pixel Perfect site.

One thing we might have to do is place a Potentiometer system going to the projection bulb or remoded Ultra Bright LED bulb so we can change the power going to it to reduce/intensify/control the lumen power it sends out.



When we go about building this we have to see how well we can time the arm to do it's task since it goes up and returns back down. Up high enough to pull in more resin and or break/lift the RP'd part from the lower tray to prepare it for the the next layer. Get it down to 15 seconds or so per layer.


Then we use the pixel perfect program to send the images to the DMD chip- not over a network- Lets keep the memory the program and task management stuff on our PC's. We will probably need a graphics card With an HDMI port to send the data.

We tell the DMD chip to start it's mirror flip into the image we sent to it- after the arm resets and returns to build new layer position. We send this image of light to this resin for 8 seconds. Then the program tells the DMD chip to shut off the mirrors completely- Not the bulb! The bulb is always on. It only lets light go to the projector when the mirrors tilt into an on position.

Then the arm raises it pulls the materials off the lower tray somehow. More resin is sent to the build tray when the clip is pulled back. And we are doing the whole process all over again.

Images should be sent from a folder. labeled 001 002 003 and so one. Program sends them. They are 2 bit color images. Gif file format is fine. SVG graphics is fine if you can change it to 2 bit color. Any color outside of blackest black and whitest white is not wanted. Lighter values of each color will cause resin cure issues against the stronger values before them. The images layers on the screen will look like they don't have aliasing to them. since they are only two color values used to make them.



The pixel perfect program should be pretty straight forward as far as representing the image by color and length of time. You don't turn off the bulb when the projects getting built. If you did that you would reduce it's lifecycle and possibly damage it. You turn the mirrors into the off position between layers. The LCOS chip works the same way but instead of mirrors it uses little led's to block the entire mirror behind them.
]]> makeit General Wed, 16 Jul 2008 17:56:37 -0400 https://reprap.org/forum/read.php?1,14319,14478#msg-14478 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14478#msg-14478 > back down again. Is that how it releases the new
> layer from the lower tray before it resets itself
> the next build?

There are two parts that move.

The "arm" which is a glass plate which the build object "grows out of". This plate can only move up and down.

The rear edge of the tray that holds the liquid can be raised and lowered.

The movement is to accomplish three things.

Separate the just build layer from the tray but not the arm.
Allow liquid to flow between the just build layer and the bottom of the tray.
Position the just build layer so the next layer can be built.

I believe the arm raising and lowering is to allow liquid to flow in and then positionning for the next layer. By this point the rear edge of the tray has been lowered. The lowering of the tray is where the just build layer is separated.

> The table/housing has to be perfectly level. A simple bubble level system is built into the table to adjust it to insure that it is level before the build is carried out.

If you have a tray full of liquid then it needs to be fairly level. Otherwise liquid will spill out or there will be dry areas. I don't believe the overall level of the table needs to be any more precise than that.
What is important is that the glass plate on the arm is parallel with the tray and the correct distance from the tray when a layer is built.

The amount of light is important. It needs to be bright enough to set the required thickness of liquild in a short time but not too bright. If the light is too bright it can set too much liquid.]]> xyz General Wed, 16 Jul 2008 15:01:25 -0400 https://reprap.org/forum/read.php?1,14319,14475#msg-14475 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14475#msg-14475
Kyle Corbitt Wrote:
-------------------------------------------------------
> I don't know whether those chips are more
> expensive than a 22" monitor or not right now, but
> I suspect that with all the projectors you see
> everywhere these days, they're falling fast.

Well a 22" Monitor starting at ~200 bucks (depending on resolution, speed and brightness)
A "give it a testrun" 7" tft is less than 70 Euro.

For this project we don't really care about the speed, and if we have to add a lightsource we don't even care about brightness.
A projector with the same resolution is about four to six times higher in price.

I don't know how much the chip itself is, but if you only buy a chip you'll have to spend money and time on electronics again.

'sid]]> sid General Wed, 16 Jul 2008 13:51:00 -0400 https://reprap.org/forum/read.php?1,14319,14473#msg-14473 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14473#msg-14473 maybe it needs to be a crt.

But removing a backlight from a tft and adding a bright light behind is not considered magic ;)

I just thought, It's way easier to reuse all the monitors electronics too.
And yes like the lumenlab projectors do.

Maybe simpler ;)
If a crt is bright enough to do the job,
then we're half way through, not?

And if not, we still can hack an ordinary tft with some lightsource
peel of the reflective layer from the el-film and put a lamp behind.

In both cases we don't need to care much about electronics,
almost everything is already system integrated, except the z-Axis control,
that will need to be synchronized with the slideshow;
again this shouldn't be hard to do with let's say our arduino.


I'd like to know how much energy will be required...
maybe it's just the wavelength, like those uv-polymers...
or both?

Does someone know about things like that?

'sid

But as long as I'm not done with my repstrap I won't start building another device
(I got four open projects at this time, I'd love to reduce, not increase ;))]]> sid General Wed, 16 Jul 2008 13:36:58 -0400 https://reprap.org/forum/read.php?1,14319,14472#msg-14472 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14472#msg-14472 -------------------------------------------------------
> Would be some sort of that much easier and cheaper
> to build ?
>
> Well, of course. The importat question is, "will
> it work?" I doubt you'll get anything like the
> same intensity from a digital picture frame as you
> would from a projector. A nice big CRT is better,
> but still nothing like the amount of light a
> projector is kicking out.
>
> You'll need that bright light to make the
> photopolymer congeal rapidly; the faster the
> better, I'd guess.
>
> There's nothing to stop you making a cheaper
> projector, of course. But I don't think its a
> component you can avoid altogether.


Right, I thought he was talking about one of the home-made projector hacks that takes an LCD screen out of its frame and shines a halogen bulb through it. I agree that an LCD on its own almost certainly won't put out enough energy to rapidly polymerize the plastic.]]> Kyle Corbitt General Wed, 16 Jul 2008 12:40:22 -0400 https://reprap.org/forum/read.php?1,14319,14471#msg-14471 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14471#msg-14471 -------------------------------------------------------
> Now I'm wondering if it isn't much easier to just
> take some sort of
> readily available Monitor to make such
> perfactory.
> Or even a digital pictureframe.

You mean something like the Lumenlab projectors? They're computer projectors home made from lcd monitors. See [www.lumenlab.com]]]> Douglas Brebner General Wed, 16 Jul 2008 12:39:12 -0400 https://reprap.org/forum/read.php?1,14319,14470#msg-14470 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14470#msg-14470 Kyle Corbitt General Wed, 16 Jul 2008 12:38:18 -0400 https://reprap.org/forum/read.php?1,14319,14469#msg-14469 Re: Perfactory Machine: Can we make one? https://reprap.org/forum/read.php?1,14319,14469#msg-14469
Quote

Would be some sort of that much easier and cheaper to build ?

Well, of course. The importat question is, "will it work?" I doubt you'll get anything like the same intensity from a digital picture frame as you would from a projector. A nice big CRT is better, but still nothing like the amount of light a projector is kicking out.

You'll need that bright light to make the photopolymer congeal rapidly; the faster the better, I'd guess.

There's nothing to stop you making a cheaper projector, of course. But I don't think its a component you can avoid altogether.]]> Ru General Wed, 16 Jul 2008 12:38:06 -0400