Gravelle's Prints and Projects

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  • rkundlarkundla Member, Moderator, Backers, Ultimate Backer
    edited August 2017
    Good video Gravelle! 

    The one thing I am not sure about is if near UV output tracks 1:1 against the sensitivity region of the photoresistor, but I don't think there is any reason to worry since you can adjust the exposure to compensate for it. It would be nice if you can get a photoresistor tuned for that region.

    Do you have links to your paper sampling mask so I can print one myself? I am going to try this out with my Draken once I get my photocell and see how it works.
    Ron
  • GravelleGravelle Member, Backers
    Yeah not a problem.... if anyone that hasn't done the UV pass filter mod yet and ordered the filter you could measure the light distribution using an unmodified projection and again with a modified projector to see if the light distribution profile is different.

    Here is the photoresistor matrix sheet: 

    -Gravelle
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
  • GravelleGravelle Member, Backers
    Some more videos will be coming out in the next couple of weeks... as a precursor though, I've learned a number of things, some of them the hard way haha.  Just remember, if you're going to refurbish the PDMS for a vat, don't use silicone sealant anywhere on the inside of the vat, it inhibits the cross linking reaction in the PDMS.  That was the unpleasant lesson I had the privilege of learning the hard way earlier today.

    -Gravelle 
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
  • Joseph_OsbornJoseph_Osborn Member, Backers
    No better teacher than experience. After replacing the PDMS, will you put down another FEP sheet? If so, what kind will you use? I have used Muve3D’s adhesive FEP to re-line a vat before, but that was a pain in the rear. I’ve also been able to remove the original FEP from a vat and put it back down in place with no apparent ill effect, so I think I’ll try using a non-adhesive FEP sheet the next time.
  • rkundlarkundla Member, Moderator, Backers, Ultimate Backer
    Not just silicone sealant, but any residual PDMS in the vat will cause the area around that residue to not fully cure.

    My worry about using non-adhesive FEP is that the pull forces of the resin to the FEP may be stronger than the cling forces of the film to the PDMS. Or are you planning to bed the film in the FEP, if it is even possible.
    Ron
  • GravelleGravelle Member, Backers
    In my experience FEP sticks reasonably well  to PDMS without adhesive.  The FEP I have is from FlexVat because they sell the Dupont FEP in smaller quantities (to get it straight from a supplier requires an order of several hundred dollars).  Its very clear and tough from the little I've used it so far.  I plan to do somewhat of a heat bond to get it to adhere and I'll use a piece of FEP that is only slightly smaller than the vat.  So the separation forces of the FEP should significantly exceed the separation forces of the build platform and thus keep it adhered.

    Also another lesson learned haha.  Don't try and get the FEP to adhere to the PDMS while its still curing.  The curing reaction releases gases that collect under the FEP as bubbles... ask me how I know this :/

    -Gravelle
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
  • GravelleGravelle Member, Backers
    The next video is up.  This one took a while to finish mostly due to my crazy work schedule.  Hopefully this helps anyone that's wanting to replace the PDMS on their vats!!!  I tried to cover as much as possible in a reasonable amount of time. Let me know if I was going to fast to follow in the video.  The vat works great and I never needed adhesive backed FEP film.


    -Gravelle
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
  • rkundlarkundla Member, Moderator, Backers, Ultimate Backer
    Another good training video on how to re-do your PDMS in the vat. I will have to try the static cling version of FEP the next time I revitalize my vat.

    I've moved away from the flex vat due to some issues I was having with release and first layer consistency. I may come back to it again, but my 3Dfacture orange vat has been working like a champ.
    Ron
  • GravelleGravelle Member, Backers
    edited October 2017
    Thanks ron, I will post up if I have any issues with the way I have done things.  I did a long print of about 30 hours earlier this week and posted a timelapse to my channel today.  Here it is:


    Print settings:
    XY Res: 84um
    Z Res: 50um
    128mb STL file
    15s exposure
    slow peel with a 3sec pause about 20% of the way down
    Autodesk Magenta Resin

    No issues with the refurbished vat, it worked like a champ!

    I've been pretty pleased with this resin, it takes a little longer to cure but it is very stable and gives good definition and print quality.  It's also pretty affordable.  I found out that apparently in addition to Autodesk not selling the ember anymore they also aren't providing resin anymore either.  But a company called Colorado Photopolymer Solutions is selling the same resin (it looks like Autodesk was just sourcing the resin through CPS).  Anyways, I will probably do a review of this resin similar to the clear resin I reviewed earlier this year.

    -Gravelle
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
  • rkundlarkundla Member, Moderator, Backers, Ultimate Backer
    I tried to do the static cling version of FEP using one of my 3Dfacture orange vats and I was getting resin underneath the film with two different types of film.

    While it does cling, I think the hydraulic force of the peel does cause the film to wrinkle somewhat, which allows resin to be drawn in underneath the outer edges of the FEP. After I was done with a print, I had to peel the FEP off the PDMS to clean the resin underneath.

    I went back and replaced the static FEP with some of my adhesive and it seems everything is okay again.

    Did you do anything to treat the PDMS to make it more stickly/active to hold down the FEP better?
    Ron
  • Joseph_OsbornJoseph_Osborn Member, Backers
    I’ll see a little bit of resin creep under the edges of the clinging FEP, but since I’m using just the center of the vat, it doesn’t affect operations at all. Now I’m on a quest to find an FEP that is slicker than what I’ve gotten from flexvat.com. The original FEP on my clear vat is much easier to print on than the flexvat.com FEP.
  • rkundlarkundla Member, Moderator, Backers, Ultimate Backer
    I tried to do an experiment using both PFA and skivved teflon on the flex vat.

    I found the skivved teflon released easier than the FEP/PFA, but it is somewhat opaque, so there is a concern on fine detail. I hate to think I am still screwing around with trying to keep consistency after having the printer for 2 years. :-\
    Ron
  • GravelleGravelle Member, Backers
    Huh, I did have an issue with resin getting under the film on the first vat recoating I did as you can see in the video. But I attributed that to the air bubbles I had under the film that provided an expansion volume.  I haven't done any really big cross section prints on the new vat... mostly because the last one I tried to do failed repeatedly because the part was getting ripped off the supports even with an extremely slow peel.... I did wipe the film pretty vigorously with a lint free cloth before laying it on the FEP so maybe that gave it enough of a static charge to stick better.  I do know that FEP inherently sticks to PDMS, despite PDMS being very hydrophobic it isn't a particularly smooth nonstick surface for a lot of other things.  I used flexvat FEP.  I'll certainly post up any issues I have in the future.  I only found it interesting that I didn't actually need adhesive FEP to get it to stick to PDMS.

    I do agree with you @rkundla , after 2+ years of using this printer I would think things would be dialed in a little more.  I was pretty disappointed that 3dfacture released another printer with it's own software and hasn't provide any such support for the printer they already produced.  I don't know how they expect to get any kind of reasonable support for their new product when anyone can come to this forum and see that for the most part its dead and there is little to no interest or support in the first printer 3dfacture released.
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
  • Joseph_OsbornJoseph_Osborn Member, Backers
    FWIW, I get predictable results and near-100% success from my machine. I’ve logged *every* print I’ve made since November 2015 and since I only use the printer in slot 3 and with one resin, there is very little guesswork. The only variables I have are the lamp output over time and the FEP vat surface. Whatever 3Dfacture used on their vats beats the flexvat.com stuff hands-down.
  • rkundlarkundla Member, Moderator, Backers, Ultimate Backer
    When I speak consistency, it usually revolves around resin, FEP and build plate. The other part is model dynamics in terms of forces during peel (how much surface area, adhesion, etc.)

    All resin printers that are multi-purpose will run into these issues. I am not mad or disappointed. I just hate it when I run into a bit of trouble and I have to go through all the steps to figure out which of the three or four potential trouble spots is the fix. ;-)

    If you take a look at the B9 forum, that place is pretty damn dead and most of the posts are people trying to sell their old machines so they can afford the new one. I think after the novelty wears off, the amount of traffic dials down. I doubt sales of the Draken are high right now, so there isn't much new blood coming online asking for help. In some way, I don't mind that the Draken is a little bit "boutique" in its availability. Our community is one with lots of experience under its belt and we do like to help each other when trouble arises. :-D

    I wish I knew where 3Dfacture got their FEP as well. I still can't put the adhesive stuff down right and I have no idea of the film on the factory vats is adhesive or not.
    Ron
  • GravelleGravelle Member, Backers
    edited December 2017
    Newest video is up.  This was a holiday vacation project that was just a fun little engineering project.  Just a tiny little pulse motor to tie off 2017.


    Here are a couple of pictures to wet your appetites ;)

    image

    image

    image

    image

    -Gravelle
    Check out my Youtube channel Garage Science for videos and tutorials about printing with the Draken.
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