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Thread: 3D printing

  1. #21
    Moderator DavidF's Avatar
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    Quote Originally Posted by Jammer View Post
    Which machine is that. Looks huge but nothing really there for scale.
    thats the FT5... still working on building it......free time has been scarce.
    A calm sea does not make a skilled sailor....

  2. #22
    Senior Member Jammer's Avatar
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    So the base lines are 400 mm square? The base looks nice.

  3. #23
    Moderator DavidF's Avatar
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    print area = 12" square base 16" high. its a monster!!
    A calm sea does not make a skilled sailor....

  4. #24
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    I spent some time looking at the website info on the FT5 and the Form2 this afternoon. The FT5 wins on build envelope and price of the machine and consumables and the Form2 on quality of the printed item. I'll be interested to see some results from the FT5 when it is running.

  5. #25
    The FT5 beating the Form2 on price is an understatement. The Form2 is seven times as expensive, but then the Form2 being a stereolithographic (SLA) printer is a different animal. My experience with 3D printing is mainly from ordering rapid prototype prints of portable electronic equipment enclosures destined for injection molding. Fused filament fabrication (FFF) items were accurate representations of the part. The finish was mat. The layers were visible but were mostly masked by the mat finish "niose". The SLA prints were shiny, but besides being stupid expensive offered no advantages. There were tiny bubbles on flat surfaces which were enhanced by the shine. The shine also made the layers more pronounced. Worst of all the SLA prints were slightly distorted. This was a problem because the enclosure was to be water tight. SLA prints are supposed to be stronger but one shattered in field trials. That said, my experience is limited. Just as there are many different filaments for FFF there are a variety of resins for SLA.

  6. #26
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    For this year's off-road ride medallion Jeff's pal Chris had it done by a friend with a Form 2 instead of last year's Polyjet part. I didn't get a chance to compare the two masters, but the urenthane copy (via silicone rubber mold) of the Form 2 part seemed very nice.

    SLA resins are $120 or so per liter for the standard stuff, and the Form investment casting resin is $200/liter, so you've got to figure out what you need before you pull out your money gun and start shooting.

    cheers,
    Michael

  7. #27
    Don't the resins have a limited open life? Isn't the Form 2 an "upside down" SLA printer? I think traditional SLA's laser the surface and then submerge a bit for the next layer.

    My rant was from one experience. Thinking again in light of how the sodium silicate wanted to stick to my FFF molds, the gloss finish of SLA prints would probably be better for patterns and core molds.

    Speaking of investment casting, has anyone tried Moldlay filament? It's a plastic but is designed to burn out as clean as wax. I noticed that Machinable Wax has actual wax filament. Sounds like a good choice when post printing processing is desired before investing.

  8. #28
    Moderator DavidF's Avatar
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    Quote Originally Posted by thrifttrust View Post
    Don't the resins have a limited open life? Isn't the Form 2 an "upside down" SLA printer? I think traditional SLA's laser the surface and then submerge a bit for the next layer.

    My rant was from one experience. Thinking again in light of how the sodium silicate wanted to stick to my FFF molds, the gloss finish of SLA prints would probably be better for patterns and core molds.

    Speaking of investment casting, has anyone tried Moldlay filament? It's a plastic but is designed to burn out as clean as wax. I noticed that Machinable Wax has actual wax filament. Sounds like a good choice when post printing processing is desired before investing.
    Ive tried both the mold lay and the machinable wax filament. Each one has its pros and cons. Its hard to beat the printability of plain old PLA.
    A calm sea does not make a skilled sailor....

  9. #29
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    Yes, it does appear that the SLA resins have a shelf life, and you don't want to mix trays/containers between different resins as some of them can vary slightly in properties with the different colors.

    If you need SLA quality in the product, then you need an SLA budget. If filament printed parts work for you, then you can buy a LOT of filament (and a pretty nice filament machine) for the price of the SLA machine.

    Jeff and I found that filament parts weren't going to work for things like the deep finned cylinder where you can't get into the gaps to finish the part to a smooth surface. Another person I know had some open/webbed chassis parts that were investment cast from 4130 steel and he was able to use filament parts BUT had to do a lot of filling/sanding/painting before pulling molds for wax injection. There were also some failed prints. Due to printer limits he had to break the parts into sections and glue them together afterwards.

    http://3.bp.blogspot.com/-_TuCeCXx-m...0/P1010467.JPG

    http://1.bp.blogspot.com/-Zp-Lj6UD1-.../moldready.jpg

    cheers,
    Michael

  10. #30
    Senior Member mutant's Avatar
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    I wonder if our hobby will soon be a thing of the past...

    http://3dprintingindustry.com/news/n...printer-85255/
    I have ulterior motives for my hidden agenda.

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