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8962RE: Re: RE: Re: Re: [diy_3d_printing_and_fabrication] RE: RE: RE: RE: Highest DIY XY resolution ?

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  • pjotr_du_mat
    Oct 15, 2013
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      "floating resin on another liquid" ??  Graham, were did you get that bit of info ? 

      Best, Pjotr

      ---In diy_3d_printing_and_fabrication@yahoogroups.com, <diy_3d_printing_and_fabrication@yahoogroups.com> wrote:

      The f-theta lens does not make the beam perpendicular, at least that is not its purpose IIRC

      That's what a few of us started looking at last year, the issue may be the standard f-theta lens from an unmodified unit not working well at the wrong wavelength (at least attenuating). I wondered if they were using a slightly different set up that might bi-pass these issues (for some other reason perhaps as they can afford custom optics no doubt).

      The other problem facing this idea was that most folks don't want to do from-the-top printing because of the requirement for lots of resin whereas the large surface area of the imagined A4 sized machine made from-the-bottom seem very tricky. What has changed is that someone has verified the concept of floating resin on another liquid and that might be just what is required to make a large format, high speed, high resolution resin based printer possible.



      On Tue, Oct 15, 2013 at 1:53 PM, <pzamov@...> wrote:

       This is all sales pitch mumbo-jumbo.

      The Laser scanning unit in every laser printer contains all of the bullet points that are as a separate description:

      LSU has an octagonal mirror spinning at high speed. It detects the start with a built in diode, otherwise your pages printed will look a bit staggered :-D. It has an F-Theta lens so the laser beam can be perpendicular to the photosensitive drum that has the toner attracted to it.

      So If we hack a laser unit from a printer and place it on linear slide. and set the home ( page start detect ) - very similar to Alvaro's hack at the start of the group - we should have a top lit 3d printer that has the A4 ( or letter/legal ) whatever format the page is.

      The Laser diode is usually an IR diode.

      The multi beam/diodes are combined so the power is combined ( There are losses on the mirror/lens F-theta group) so the curing can happen much quicker.

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