Home > Build Base, Post Cure, Resin > 4 Rings – Last night’s Platform…

4 Rings – Last night’s Platform…

February 19th, 2012

Last night I decided to test the printer with some new resin I got from Fernando @ http://www.spotamaterials.com/

Here are some photos and I have added them in the “Gallery” Section above.

  1. PHenson
    March 4th, 2012 at 06:28 | #1

    I was curious about the chemical formulation of the resin you purchased from SpotMaterials. I had participated in the discussions at ChemShapes.org in the development discussions group and in particular the resins formulation threads as 4Dabbler a while before things splintered off and seemed to go under the radar. I did some extensive paper chase and research on resin formulations including the mystery formula of the stuff used by Junior Veloso versus all the previous publication circulated formulas or recipes such as the the nanotech/nanofabrication development group at University of Illinois and others.

    Most all involved Phenylbis based monomer chemistry polymerizing of an acrylate base that is activated by the chemical equivalent of the commercially branded photoinitators products IRGAcure 784 or 819. Also I am curious as to whether your resin brew is tinted by Sudan yellow tinting dye as your jewelry prints are obviously a pretty colorfast yellow after curing completion. It has been the light filtering agent of choice for most work so far due to previous documentation and chemical stability plus predictable dilution/filtering behaviors.

    I halted my work last summer when it became evident that trying to beat the $200 per liter barrier on a ready to run photo-initator resin was not feasible without doing mass production resin formulation and mixing. I am still discussing a joint venture with a local chemist to do some volume batch runs to produce 2-3 gallon per run yields at about 250 dollars materials cost per run soon. I did finally derive what seems to be at least two viable and stable formulation permutations.

    I got sidetracked into a lot of other more pressing day to day stuff and have only been surfing the web and reading blogs and discussion boards or such to keep up to date on the state of stuff since. As such I have yet to finish assembling and testing or troubleshooting the hardware I bought to build my rig from. Also I am wanting to stay away from typical DLP projector HW entirely and use either UV/near UV band illumination lasers or LED devices as the photo-emissions input source.

    I am currently meddling with the possibility of using light transmission type LCD panels such as those used in early generation VGA projection panels which were meant to allow retrofit or reuse of older transparency film overhead projector devices. I have done some rudimentary testing about the level of effective UV/near UV band light that can actually pass through or is absorbed by the panel. I still need to some more serious accuracy photometric testings to get solid numbers for calculation of exposure times and levels.

    Also I am looking at and hypothesizing the workings for an inkjet resin deposition method with a linear tracked-trailing scan and exposure array that applies and sets or activates resin pretty much only as it is needed or solidified to get rid of the vat and bath issues. It would still sort of work like your device as to the build object being effectively lifted up and away from the process activation stage but after that things change significantly as the active build space area kind of hangs in space at the bottom-most face or layer of the ascending part. Also the method allows doing multicolor and multi-polymer or treatments/coatings applications which cannot be done in the vat bath.

    It is interesting reading and following your blog and I am enjoying your videos and information published here very much. Nice to see you getting solid results and output. -Philip

  2. June 7th, 2012 at 15:48 | #2

    First: You have done really impressive work!
    Second: May I request a posting about some parameters you are using, like the projector, lumens, exposure time per layer, building area, layer height and so on? You know best what may be important ;-)

    Thanks a lot for this blog!

    • Printer
      June 14th, 2012 at 21:24 | #3

      Thanks Sloth3D!
      The projector is not that much of a variable other than the ease of modification. The info is posted in the Hardware section.
      The exposure time per layer is not a constant. It varies from 1.7 sec to over 60 seconds depending what resin and what thickness of the layer I am building.
      The build area I have not changed for now = 57.25×43.25mm. The layer height is 25 micron. The burn in layers can be from 50 micron to 200 micron again depending on the resin I’m testing and building with.

  3. June 15th, 2012 at 09:31 | #4

    im not getting which resin is best cost fast building and i can cast it ??

    i personaly like the one 3dshape have red is ceramic and yellow for cast

    you make world smaller now with your 3dprinter !!!!!!
    now the commercial printer will fall down the sell 80000 euro one
    film foil 100euro one pieces

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