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Dr. Mike

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Everything posted by Dr. Mike

  1. 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
  2. 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?
  3. 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).
  4. Thanks for the response Selami. You are exactly correct.
  5. 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.
  6. 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.
  7. The double rack is 40 cm tall. The single rack is about 20 cm tall. Hope this helps.
  8. 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.
  9. 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/
  10. 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/
  11. Ha! I'll bet the 3D printing engineering job is with our member @bethripley. That should be a fantastic opportunity!
  12. 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.
  13. 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.
  14. 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.
  15. 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/
  16. 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
  17. 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?
  18. 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.
  19. One of the biggest problems that health care workers have with the current COVID-19 coronavirus pandemic is the severe lack of PPE. 3D printing has helped with some items like face shields. One of the biggest shortages is with N95 masks. These masks have special, high-quality filters that simply cannot be 3D printed. While 3D printing cannot make N95 masks, it can be used in part to build an UV light box that can help to disinfect/sterilize used masks and make them safer to reuse. I built such a device and gave it to my local hospital. I've documented the build process here in this video tutorial! I've made the 3D printable files for the N95 mask holder available and free for download. Materials for this build (As an Amazon Associate, we earn from qualifying purchases, thanks for your support!) UV Lamps: 14" UV germicidal lamp (may be sold out): Alternative 60W LED UV lamp w standard E26/E27 socket: Another alternative 60W UV LED lamp : E26/E27 light socket (needed for 60W lamps): Other supplies: Brinks digital timer Heavy Duty aluminum foil Gorilla glue Machine screws and nuts (use #6) Washer set Adhesive velcro-type tape Hook and loop cable ties Large cardboard boxes Packing tape White spray paint Silver spray paint Please consider making a similar box for your local health care facility that is battling coronavirus! Disclaimer: Nothing in the video should be interpreted as medical advice. This isn't an FDA-approved method of sterilizing or disinfecting medical equipment. Use appropriate care when working with UV light.
  20. Version 1.0.0

    971 downloads

    This is a 3D printable holder for N95 masks as featured in the DIY UV sterilization box video below. This is the two mask holder. Click here for the one-mask holder. The mask holding segments are stackable and can be stacked up to 4 levels high. They are designed to fit a standard 3M healthcare N95 mask and grip it so it does not fall out. The backside of the holder is open to faciliate cleaning (such as with UV light) of the inside portion of the mask as well as the outside. This holder can be printed in 11 separate sections that are then easily assembled in about a minute or two. Assembly instructions are included with the download. This is the two mask holder. Click here for the one-mask holder. If you want to order sets of 6 3D printed for you, you may do here (single mask holder 6-pack, double mask holder 6-pack) You may download and 3D print this file yourself for non-commercial use under the Non-Commercial Creative Commons license (CC-BY-NC-ND). If you wish to use this for commercial purposes (e.g. manufacturing and selling printed parts), please contact me for a license. Registered members can message me at any time. You must be logged in to send messages.

    Free

  21. Version 1.0.0

    348 downloads

    This is a set of 6 3D printable holders for N95 masks as featured in the DIY UV sterilization box video below. The mask holding segments are stackable and can be stacked up to 4 levels high. They are designed to fit a standard 3M healthcare N95 mask and grip it so it does not fall out. The backside of the holder is open to faciliate cleaning (such as with UV light) of the inside portion of the mask as well as the outside. This holder can be printed in 6 separate sections that are then easily assembled in about a minute or two. Assembly instructions are included with the download. This is the set of 6 two-mask holders that can be ordered 3D printed. For the set of 6 one-mask holders, click here. Click for the individual one-mask holder and individual two-mask holder. Files for download are the same for all holders. You may download and 3D print this file yourself for non-commercial use under the Non-Commercial Creative Commons license (CC-BY-NC-ND). If you wish to use this for commercial purposes (e.g. manufacturing and selling printed parts), please contact me for a license. Registered members can message me at any time. You must be logged in to send messages.

    Free

  22. Version 1.0.0

    60 downloads

    This is a set of 6 3D printable holders for N95 masks as featured in the DIY UV sterilization box video below. The mask holding segments are stackable and can be stacked up to 4 levels high. They are designed to fit a standard 3M healthcare N95 mask and grip it so it does not fall out. The backside of the holder is open to faciliate cleaning (such as with UV light) of the inside portion of the mask as well as the outside. This holder can be printed in 6 separate sections that are then easily assembled in about a minute or two. Assembly instructions are included with the download. This is the set of 6 one mask holders that can be ordered 3D printed. For the set of 6 two mask holders, click here. Click for the individual one-mask holder and individual two-mask holder. Files for download are the same for all holders. You may download and 3D print this file yourself for non-commercial use under the Non-Commercial Creative Commons license (CC-BY-NC-ND). If you wish to use this for commercial purposes (e.g. manufacturing and selling printed parts), please contact me for a license. Registered members can message me at any time (must be logged in).

    Free

  23. Version 1.0.0

    254 downloads

    This is a 3D printable holder for N95 masks as featured in the DIY UV sterilization box video below. The mask holding segments are stackable and can be stacked up to 4 levels high. They are designed to fit a standard 3M healthcare N95 mask and grip it so it does not fall out. The backside of the holder is open to faciliate cleaning (such as with UV light) of the inside portion of the mask as well as the outside. This holder can be printed in 6 separate sections that are then easily assembled in about a minute or two. Assembly instructions are included with the download. This is the one mask holder. Click here for the two-mask holder. If you want to order the holders printed you may do so in sets of 6 here (single mask holder 6-pack, double mask holder 6-pack) You may download and 3D print this file yourself for non-commercial use under the Non-Commercial Creative Commons license (CC-BY-NC-ND). If you wish to use this for commercial purposes (e.g. manufacturing and selling printed parts), please contact me for a license. Registered members can message me at any time. You must be logged in to send messages.

    Free

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