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Dr. Mike

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Everything posted by Dr. Mike

  1. Very nice. Looks like a spacious build platform.
    I've printed this model many times, both in PLA and using stereolithography resin. The images below are an example using polished clear resin that the embodi3D service uses. Make sure to use adequate support for the fine structures inside the heart chamber and it should turn our great. If you don't want to print it yourself, you can order it printed through the embodi3D print service.
  2. Our own Dr. @valchanov has been featured in a wonderful article on sketchfab.com that discusses his foray into medical 3D printing. Congrats Peter!
  3. I too, and having trouble with PLA-BVOH in the Palette. The joints just don't hold and over the course of a print they fail.
  4. Very cool! I did something similar when I designed a functional aortic valve dynamic flow TAVR tester. The hardest part about printing in elastic is the valve leaflets. They are thin and susceptible to tearing. Also, they can stick together. It was a tricky print! Mike
  5. This is a great post Angel. Initially, need for PPE was focused on hospitals. As business start to open up again, I am seeing increasing demand from office-type facilities like dentists and orthodontists. These businesses have high COVID exposure risk, but don't have the infrastructure like a hospital for obtaining PPE. What innovations exist to fill this unique need?
  6. This is similar to carbon fiber reinforced PLA, which is much stronger than regular PLA. This type of material has the possibility to produce very strong parts. And the concept of fibers that run at different angles can create a much stronger material than even pure PLA, sort of how the layers of plywood give more added strength compared to regular wood alone (see below).
  7. Thanks for the response Selami. You are exactly correct.
  8. Oh yes, Prusa slicer is great. I use it, but only with my Prusa Mk3S. Isn't it hardware-specific then? Preform is another slicing package, but of course, it is only usable on Formlabs STL printers.
  9. I like Simplify3D because you can try out different profiles on the same print bed. This allows more rapid developing of a good printing profile for a given material.
  10. The double rack is 40 cm tall. The single rack is about 20 cm tall. Hope this helps.
  11. Drag and drop the NRRD file onto the upload panel in democratiz3D, and then complete the rest of the form. Your file will then start to convert to a mesh in STL file format.
  12. Here is a nice article on PLA print finishing. Nothing earth-shattering, but solid ideas. I've never tried the epoxy route. Sounds messy. https://3dinsider.com/finish-pla-prints/
  13. Here is another round of 3D printing jobs. Senior Research Scientist at Youngstown State University 3D Manager at Bluedge Tim Spahr joins 3DXTECH https://3dprintingindustry.com/news/3d-printing-jobs-bluedge-and-youngstown-state-university-are-hiring-career-moves-at-stratasys-dassault-systemes-amaero-and-3dxtech-168782/
  14. Ha! I'll bet the 3D printing engineering job is with our member @bethripley. That should be a fantastic opportunity!
  15. A worldwide collective of researchers and scientists from universities, institutions, and hospitals have come together to produce a roadmap for 3D bioprinting. Published in Biofabrication, the paper details the current state of bioprinting, including recent advances of the technology in selected applications as well as the present developments and challenges. It also envisions how the […] View the full article This is an interesting outline for how far biomedical 3D printing can potentially go. Right now we are only at stage 1.
  16. This is great concept. Currently pharmaceutical release is dictated chemically, but with 3D printing geometry can be added and used to control drug release. It is a whole new variable to work with.
  17. Smarter Every Day, a popular science and engineering YouTube channel, released this terrific video on how they have developed a whole operation to 3D print face shields for their local hospital. It is worth a view for sure.
  18. Bob, Thanks for sharing your files. They look awesome! As I mentioned to Jerry, please consider formally sharing these in the COVID-19 download category so your files can be easily found by others specifically looking for coronavirus related 3D prints. Thank you! https://www.embodi3d.com/files/category/60-covid-19/
  19. Jerry this is fantastic!!! Thank you so much for designing this and sharing with the community. Would you mind uploading your files to share in the COVID-19 model download category? Here is the link. This will allow 1) others to more easily find your files, 2) give you the opportunity to provide an explanation for use and track downloads, and 3) choose an appropriate Creative Commons license so that you wishes about non-commercial use are respected. https://www.embodi3d.com/files/category/60-covid-19/ Again, thanks for the great share and for being an embodi3D member! Dr. Mike
  20. I hear you Bill. Thanks for your great comments. I think it is important to consider what the alternative it, which is nothing. Right now in my area the ICU docs report to me that they are reusing the same N95 mask for an entire week without any kind of cleaning or sanitation whatsoever. What we are trying to do is provide a solution that is cheap and easy to implement, and while not optimal, better than the alternative which currently is nothing. Angel provided some great references in his post above, including this one to CDC guidelines. This UV irradiation as a "crisis standard," which is guess means something that would be done in a crisis but not otherwise. You are correct, UV will not penetrate, but it will potentially eliminate surface contamination and transmission should the provider be handling the mask. This article from the New England Journal of Medicine concluded that the SARS-CoV-2 virus is stable on cardboard, the best analog for the material in the mask, for 24 hours. So, in theory any particles trapped deep within the mask will be inactivated in that time even without UV. Surface contamination is what is more worrisome because the mask is handled both in putting on and taking off, and that could provide the potential for virus spread. Now that I am thinking about it, when I come out of a COVID patient room I usually take my gloves off first, then gown, then faceshield, then mask, then I gel my hands. But, in theory, by handling the mask at the end I could be contaminating my hands, thus leaving the gel as the only precaution against infection spread. Maybe we should be UV zapping our masks after every use instead of just at the end of the day? It only takes 5 minutes. It's got me thinking. Anyone else have thoughts on the matter?
  21. Thanks for the comment. This source reports aluminum reflectivity at 248nm of 92.6%. This study specifically looked out household aluminum foil and is reporting a total reflectivity of between 80 and 90% in the UV range. Here is another publication that shows reflectance in the low 90% range for aluminum between 200 and 500nm. All are pretty consistent with the numbers for UV at around 245 nm which is that wavelength used in this project. I think it is safe to conclude that the reflectivity is probably adequate for this project.
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