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LCD Based SLA Resin Printer

Discussion in '3D printers' started by evilc66, May 3, 2016.

  1. ComicBit

    ComicBit New
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    Keep going and let us updated! Good luck!
     
  2. Mysta

    Mysta New
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    Are you familiar with them? Any idea how I could get rid of the inconsistencies, is the cure time too long? Or is that jsut from not cleaning it fully?(I did leave it under uv lamp way too long I think)
     
  3. ComicBit

    ComicBit New
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    Just a little bit. Try to tweak a little bit on curing times, may they are too high. Also ensure that you're using the full resolution of your display. And try! For sure this little babies are far easier than FDM ones to use
     
  4. ComicBit

    ComicBit New
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  5. evilc66

    evilc66 Journeyman
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    If you want to start off easy, then just get an LCD and use the daylight curable resins. With the stock backlight, cure times will be much longer, but it drastically simplifies the setup. After that it's just a linear stage for the Z, a vat, build platform, frame, and support electronics.

    I wouldn't say the 5.5" screen is "better". Just a different option. The nice thing about going with the iPad screen is that it's cheap for the whole setup (about half of the 5.5" screen and controller). The 5.5" will have better definition, but the iPad screen will offer a much larger print area.
     
  6. TeeKay

    TeeKay New
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    Might start with something like that, will be much easier to tinker on an existing machine and try to improve it than go for a more advanced one from scratch :)

    I'm guessing i can still upgrade the lcd backlight later on but just as a ballpark figure, what would the cure time be with a stock screen?

    Just need to find some good resource to read up on for the vat and build platform, coming from the FDM printing side those are the parts that i know least about so far :) If you know any good resources, please let me know :D

    Thanks for the help!
     
  7. evilc66

    evilc66 Journeyman
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    Cure times will vary with backlight intensity and resin used. A decent starting point would be to find out what the cure times are for some of the smaller Photocentric3D printers, which use the same basic setup concept.

    As for the vat, the only truly important part is the film for the bottom. Current popular choice is FEP film. It's a little expensive, but it's the best choice right now. You can find it at Amazon and McMaster Carr. For the vat itself, that can be almost anything that is rigid enough to support the film under tension.
     
  8. Mysta

    Mysta New
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    Here's latest on the Instagram post by mattmann • Apr 7, 2017 at 3:07pm UTC
     
  9. TeeKay

    TeeKay New
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    Awesome, already found an EU supplier of FEP film and designign a flexvat for the ipad screen size :)

    1 other thing, i've seen all the printers usually have a vivid colored acrylic cover, like the bright orange on form 2 and couple of others, green on some, etc. Im guessing thats not just for aesthetics?

    Do you need a special kind of cover over your printer / special kind of acrylic?
     
  10. evilc66

    evilc66 Journeyman
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    Well, you want to block the wavelengths of light that would prematurely cure the resin. For the vat, you can make that opaque if you like. For a cover for the machine, red transparent acrylic will work pretty well, as it will filter out most of the blue light from the room light.

    Not 100% sure about what color would work best for UV cure resins, but you can get acrylic that is treated to block UV.
     
  11. AS-3DDruck

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    That is also a Thing that i keep searching right now.
    What Material will block near or everything of the UV Light?

    The Formlabs use this Orange and a few other "cheaper" use red.
    Maybe i should get some glow in the Dark Material to print with my FDM and test it with a few "hopefully" cheap Acryl Glases.
     
  12. TeeKay

    TeeKay New
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    Was checking a bit and aparently acrylic wont pass much uv light as it is, amber/red especially

    "The results show that this material has 0% UV transmittance for 200~400 nm."

    Hopefully that will work for daylight curr as well
     
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  13. AS-3DDruck

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    1 Other Thing.
    Does it matter how far away the LEDs are from the Display?
    If yes how far should they be?
     
  14. evilc66

    evilc66 Journeyman
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    That's a difficult question to answer. Put it too far away and the intensity at the LCD panel drops, increasing cure time. Get it too close and you create hot spots where the resins cures at a different rate than at other areas of the vat. This is something that you may want to make adjustable so that you can play with the distance and get the best results.
     
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  15. evilc66

    evilc66 Journeyman
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    That's a difficult question to answer. Put the LED too far away and the intensity at the LCD panel drops and cure time increases (but intensity across the LCD is more uniform). Put it too close and you create hot spots where the resin cures at a different rate than other areas of the vat. This is something that you may want to make adjustable to you can find the sweet spot.
     
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  16. Mysta

    Mysta New
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  17. evilc66

    evilc66 Journeyman
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    The heatsink and fan will be fine, but the lens will be useless. It won't create a very even distribution of light. The deep reflector that the Wanhao D7 uses is a much better option.
     
  18. Kleinde

    Kleinde New
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    What is the latest thought on using this 15.6" 4k panel?
     
  19. OmniDental

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    Are any of you familiar with this tech? it sounds similar to what you are trying to achieve. Technology – Structo
     
  20. staccers

    staccers New
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    long time no seen evilcc66 :)
    fyi, the printer was indeed of poor quality. One day for some month ago i came back to my workshop and it was messed up with resin all over the floor during a lack of construction of the printer.:cry: Calling their support was no luck...:banghead: So i took a break again.

    now im thinking of redesign it using some updates from their community-members and pick some information from here. what i need to do is replace the lead screw, pcb and screen and reuse the shell....

    Your concept of printer, have you succeeded to print with the setup or do you have a suggestion of replacement screen? thanks for advice!
     
  21. kalidem

    kalidem New
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    Hi TeeKay, what supplier do you find for Ipad screen size ??

    Thanks
     
  22. TeeKay

    TeeKay New
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    Fepsheet.com has custom sizes you can order.
     
  23. kalidem

    kalidem New
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    Thanks TeeKay !!
     
  24. Kvirre071

    Kvirre071 New
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    Hi,

    You guys mentioned my previous iPad printer (on page 5) in this thread.
    Seem like there is some good information here on this page.

    If I could interest you in my latest printer
    Mini Daylight SLA - Kvistholm

    This is a cheaper and more minimal printer in every way.
    Less electronics and so on.

    Ask me here if you like to know more.
     
  25. Oneminde

    Oneminde New
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    Tjena och tackar för att du hoppar in och kommenterar samt introducerar din nya maskin.

    Perhaps and if you don't mind, create a new thread with in depth details on how you made everything work. I am sure there are people who want to build but are not as skilled as you. I know I would love an in depth build thread. If you do, please post a link to the thread in this thread.

    I want to try replicating your Mini Daylight SLA.

    1. What resins do you use ?
    2. What is the Z resolution and is it possible to run it layer free or is blank/black periods necessary for new resin to flow into the cavity ?

    Oneminde
     
  26. Kvirre071

    Kvirre071 New
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    Hi,

    I'm affraid I will not be able to post a step by step instruction.
    But I guess there are others that have done that.

    My point is to try introduce what hardware I used so that someone who is unsure what to order, knows what could work.
    I will however as I said try to answer some questions, starting with yours.

    1. What resins do you use?
    >> Photocentric Daylight Resins - link

    2. What is the Z resolution and is it possible to run it layer free or is blank/black periods necessary for new resin to flow into the cavity ?
    >> There is no fixed Z resolution, you can set what ever you like. There is a trade-off with time as always.
    >> No, it's not a continuous printing solution. To do that you need a quite expensive VAT material, which also has it's limitations.
     
  27. Oneminde

    Oneminde New
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    Thanks for the reply.

    Since I've not used Nano DLP yet, do you mind sharing the layer settings you use unless it is recommended settings from Photocentric ?
     
  28. Kvirre071

    Kvirre071 New
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    Hi,

    I don't have close at hand but a 50 mic layer cures at 45 seconds.
    Vertical lift I use 5 mm.
     
  29. OCD3D

    OCD3D New
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    I've been printing with FDM printers for close to two years now, and have recently been bitten by this SLA bug. I've considered just buying one of the Wanhao D7's, but I'm the kind that likes to spend four times as much building my own (that may or may not work)...

    I just wanted to say that I've enjoyed reading through your thread, evilc66... I hope you have success with your project, and thanks for all of the information you've offered so far!
     
  30. evilc66

    evilc66 Journeyman
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    Sorry for the leave of absence guys. Between selling a house, buying a house, then spending the next six months renovating the place before even being able to move in, I've been a little busy. We are fairly well settled into the place now, and I have a workshop started in the basement. The C-Beam FDM printer is set up down there now, but has been causing me some headaches that I think I have finally sorted out now, and will be put to work making parts for the SLA printer. I'm not saying that progress is going to be swift, but hopefully it will at least move forward. Half the challenge is finding parts in all the boxes!

    After getting back on the forum, I come to find out that Photobucket are being a bunch of bastards and not allowing 3rd party hosting unless you fork over money. Eff that. I'll have to go back and re-link the pictures at some point.

    Anyway, next step is going to be making the mounting frames for the LCDs.

    Fortunately, I haven't found any other new LCD options to create upheaval in the design again ;) Plan is to start with the Fire HDX screen first (it will fit the frame I have already built), then the 15.6" 4K, and the 5.5" 2K screen version after that.
     

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