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DIY Laser-3D-Printer on Instructables

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DIY Laser-3D-Printer on Instructables

Postby Seb » Fri Nov 18, 2011 10:23 am

I love Instructables, great site with quirky and amazing projects. This morning, I had this instructable hit my inbox :

3D Laser Printer Build

Though the more technically adept on the forum might enjoy reading through this guy's efforts. The results have made some decent models so far.

- Seb. :)
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Re: DIY Laser-3D-Printer on Instructables

Postby mangozac » Fri Nov 18, 2011 10:52 am

I beat you to it by 48 hours :P http://www.resinaddict.com/forum/viewtopic.php?f=3&t=164&p=5616#p5616
I keep contemplating giving this a go, but the bottom line is that it still doesn't have the resolution necessary for miniatures. Would be a far better alternative to cupcake/reprap for larger scale models though. I wonder how tough the cured material is?

The problem I have with instructables is the amount of crap you have to wade through to get to something decent. But I guess all sites with a large user base can be like that...
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Re: DIY Laser-3D-Printer on Instructables

Postby Seb » Fri Nov 18, 2011 12:03 pm

Argh! haha..

Feel free to delete the topic :D
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Re: DIY Laser-3D-Printer on Instructables

Postby blind pig » Fri Nov 18, 2011 2:04 pm

mangozac wrote: I wonder how tough the cured material is?


If the UV cure resin is anything like the UV stuff they use at my work to do 3D prints of peoples skulls/pelvis/hearts/tumours, then it is like acrylic resin. Tough, but will shatter if dropped.

And no, they will not let me play with their pretty machines. :roll:
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Re: DIY Laser-3D-Printer on Instructables

Postby mangozac » Fri Nov 18, 2011 7:37 pm

Seb wrote:Feel free to delete the topic :D

It's no problem - we may as well discuss it in its own thread 8-)

blind pig wrote:If the UV cure resin is anything like the UV stuff they use at my work to do 3D prints of peoples skulls/pelvis/hearts/tumours, then it is like acrylic resin. Tough, but will shatter if dropped.

I wouldn't imagine many 3D printing materials standing up to being dropped!

It seems that the resolution is related to how well you can focus the laser. He also mentions that professional machines wipe consecutive layers of the goo over the top of the model, whereas this one simply dunks the build platform after each step to achieve the same thing (although apparently it's not quite as good).

I'll let this rattle around in my brain and stew for a bit. I've still got to get around to building the improved controller for my router (with tool length compensation and spindle control).
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Re: DIY Laser-3D-Printer on Instructables

Postby Fleafa » Fri Nov 18, 2011 8:30 pm

mangozac wrote:I wouldn't imagine many 3D printing materials standing up to being dropped!


Depends. Shapeways' White Strong & Flexible is Nylon powder bonded into shape. Very resilient!
http://www.youtube.com/watch?v=8hNa2_vvYzg
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Re: DIY Laser-3D-Printer on Instructables

Postby blind pig » Fri Nov 18, 2011 8:50 pm

mangozac wrote:It seems that the resolution is related to how well you can focus the laser. He also mentions that professional machines wipe consecutive layers of the goo over the top of the model, whereas this one simply dunks the build platform after each step to achieve the same thing (although apparently it's not quite as good).


Huh, the one I've seen is a big vat of liquid with a UV light scanning over the top of the resin, then the build table drops a tiny amount, then the machine goes back over the top and repeats until the job is done.

The whole machine is kept in an enclosure that keeps it in the dark.

You can get UV LAZORS!!!!, yes?
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Re: DIY Laser-3D-Printer on Instructables

Postby Fleafa » Sat Nov 19, 2011 2:41 am

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Re: DIY Laser-3D-Printer on Instructables

Postby factor40 » Sat Nov 19, 2011 5:31 am

Did anyone happen to follow the link from that article?

http://3dlprint.com/

Homemade DLP printer...
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Re: DIY Laser-3D-Printer on Instructables

Postby mangozac » Sat Nov 19, 2011 7:34 am

Wow now we're talking! Still not Objet resolution, but if the price is right quite acceptable for making basic forms (like I had hoped to do with the router before I discovered how long it takes to machine stuff on it)(yes, I know that the 3D printer takes ages, but probably not as long as the router, plus you don't have the noise of a spindle motor).

Seriously guys, lets keep an eye on this! :ugeek:
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Re: DIY Laser-3D-Printer on Instructables

Postby blind pig » Wed Nov 23, 2011 11:55 pm

Was thinking tonight. If you were smart enough, and knew an Electronic Engineer, and had a spare LAZOR!!!! lying around and knew how to plumb in a UV laser into it as well as making the x axis gantry controlled, do you think you could make a 3D printer using a UV cure resin?

http://www.crystalaser.com/new/uv-laser.html

Or with the planoconvex lens that my LAZOR!!!! uses, would a UV LED (or several) do an adequate job?
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Re: DIY Laser-3D-Printer on Instructables

Postby Lane » Thu Nov 24, 2011 3:20 am

From what I understand about UV cured resin it could be quite frustrating to use in a home made machine.

The detail it produces is quite good but any overhangs can be difficult to produce accurately. The resin tends to cure deeper than the step depth. IIRC one pro grade machine could be off on thickness by .005".
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Re: DIY Laser-3D-Printer on Instructables

Postby mangozac » Thu Nov 24, 2011 7:04 am

Lane wrote:The detail it produces is quite good but any overhangs can be difficult to produce accurately. The resin tends to cure deeper than the step depth.

Ahh yes I wondered about that. My impression was that it comes down to how well the laser is focused.

The thing is that the DIY machines linked to above are actually using a projector based curing system which projects the entire slice of the model in 2D. Makes for a much shorter processing time than having to scan a laser back and forwards on 2 axes, but I'm guessing has a direct impact on what you describe above.

blind pig wrote:Was thinking tonight. If you were smart enough, and knew an Electronic Engineer, and had a spare LAZOR!!!! lying around and knew how to plumb in a UV laser into it as well as making the x axis gantry controlled, do you think you could make a 3D printer using a UV cure resin?

It would still be quite a bit of work, and I'm pretty sure those kind of lasers are overkill for the application. It may be easier off starting with a small 3-axis router like the one I bought from China as a base.

Or just wait for this guy to begin selling kits...

blind pig wrote:Or with the planoconvex lens that my LAZOR!!!! uses, would a UV LED (or several) do an adequate job?

I had heard that LEDs aren't powerful enough, but I'm not sure how correct that is.

The other option may be to get a really high resolution, small size TFT LCD screen (say, 6"), pull off the backlight and fit a UV backlighting system in its place. Then all you need is a single stepper motor for the Z-axis. As Lane mentions though it could run up against layer thickness issues.

Am I correct in my understanding that the best 3D prints like the Objet machines come from using SLS technique?
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Re: DIY Laser-3D-Printer on Instructables

Postby mangozac » Fri Apr 06, 2012 6:50 pm

So as mentioned in one of the above posts I was taking a particular interest in the printer being developed here. Interestingly it was mentioned again on one of the blogs I frequent (hack-a-day) today, detailing the Indigogo campaign they are using the fund the printers.

Basically it's a complete load of crap. The comments on hack-a-day confirm that it would be extremely foolish to invest in the product from this guy - if the stupid pricing didn't put you off first! I mean seriously, $59 for him to email you a PDF with pictures of the design, without any measurements of technical detail?!? I can't believe people have signed up for that! The price options for an actual printer kit are pretty over the top too for what is essentially a hobby machine.

The printer options he is offering are very overpriced and he is making all of these statements about high UV curing resin costs forcing him to produce his own when there are apparently already companies offering it at $40 per kg!

From other stuff I've been reading the most promising, open source design is the Lemon Curry (no idea what the name is about) project. I'll certainly keep an eye on that one!

Anyway, mini-rant over :P
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Re: DIY Laser-3D-Printer on Instructables

Postby Fleafa » Sat Apr 07, 2012 8:19 am

Wow, those investment perks are seriously unimpressive...
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