On 16 May 2017, at 20:18, Chris Albertson wrote: > I think using a screen only works on small size printers. Bigger screens > lack resolution. The phones and tablets have about 300 pixels per inch. > > > Look at monitors. The new "standard" is 4K. If it is 20" across that is > 4000/20 pixels per inch or 200 pixels per inch. Not as good as an Apple > iPhone that has about 300 per inch. Then as monitors get bigger they > still have the same 4K pixels.
Interesting how 'standards' develop, I work with two Apple Cinema displays which must be 15 years old. Both have 4K pixels. So the new 'standard' is actually very old indeed. That suggests that an effective 'standard' might be a fixed pixel density of, say, 300 pixels per square inch (same as a good quality printed image) but the larger the screen area the more the absolute number of pixels, to maintain the overall resolution. That would make sense for an application like 3D printing, where the resolution should stay the same no matter the size. Gene might correct me, but I reckon the number of pixels and the overall size of the screen is a bit of a smokescreen. You need to push a larger screen further away from you to view it properly, so the effective resolution is not the number of pixels, but the number of pixels at a particular distance. Again, not useful when applied to 3D printing, unless you want to make the surface of the object appear smoother than it really is. Marcus > > And what makes the printer cheap is mass production. They can set up a > production line and make thousands of them because there are millions of > identical iPhones. If they used a monitor and some random Windows PC > they could never get it to work. The phones are all identical and that is > the key that allows mass produced printers > > Also it is only because you already own an iPhone that the cost can be so > low. The phone has an ARM processor in it that is more powerful than the > Pi 3. and built-in 300 DPI screen. We all know how hard it is to get > real-time software running on random PC hardware. Running only on a phone > solves that. > > > Sounds like the max size is the size of the screen. How does the cost >> scale if the tank is made bigger, like sitting on the face of a 21" >> monitor? >> >>> Larger versions use a larger LCD screen from a tablet. >>> >>> The commercial version of this technology uses a laser to scan the >>> image on the bottom of the tank like an image scanner but backwards. >>> The laster spot can be made to 0.001 resolution. Phones and tablets >>> are closer to 1/300 inch. >>> >>> But the advantage of using the mill is that you could be up and >>> running for about $100 or less. >> >> That sounds appetizing, but the glacial speed doesn't. >> >>> On Tue, May 16, 2017 at 6:27 AM, Gene Heskett <ghesk...@shentel.net> >> wrote: >>>> Greetings all; >>>> >>>> And the next logical question from me is: >>>> >>>> Has anyone put a printhead on a std moving table milling machine, >>>> and used it to do some 3d additive printing? I am "out of room" for >>>> more machines, and that seems like a possible to do project. Doing >>>> it well would remain to be seen. >>>> >>>> The printhead seems like the lessor of two aspects, as a heated bed >>>> that big seems to be the bigger problem. >>>> >>>> Discussion? >>>> >>>> Cheers, Gene Heskett >>>> -- >>>> "There are four boxes to be used in defense of liberty: >>>> soap, ballot, jury, and ammo. Please use in that order." >>>> -Ed Howdershelt (Author) >>>> Genes Web page <http://geneslinuxbox.net:6309/gene> >>>> >>>> ------------------------------------------------------------ >>>> ------------------ >>>> Check out the vibrant tech community on one of the world's most >>>> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >>>> _______________________________________________ >>>> Emc-users mailing list >>>> Emc-users@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> Cheers, Gene Heskett >> -- >> "There are four boxes to be used in defense of liberty: >> soap, ballot, jury, and ammo. Please use in that order." >> -Ed Howdershelt (Author) >> Genes Web page <http://geneslinuxbox.net:6309/gene> >> >> ------------------------------------------------------------ >> ------------------ >> Check out the vibrant tech community on one of the world's most >> engaging tech sites, Slashdot.org! http://sdm.link/slashdot >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > > -- > > Chris Albertson > Redondo Beach, California > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
