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Dr. Mike

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Posts posted by Dr. Mike


  1. A user recently asked me this question. I am posting the response here so others can benefit from the answer:

    "However, I have a question:

    Please note that the images do not show the hyoid bone (this horse-shoe shaped bone should be visible just under the jaw/withing the jaw bone) and no parts of thyroid catrilage are visible either.   Would you be able to let me know if it is possible to show those.please."

    Answer: democratiz3D will remove small bones automatically from models. This prevents small calcifications, particularly vascular calcifications, from being erroneously included in the model. If a desired structure is being accidentally removed, you can increase the model quality (High/Ultra) or decrease the threshold level and the missing part will be more likely to be included. It may take some trial and error to achieve the perfect result.

     

    Hope this helps,

     

    Dr. Mike


  2. A user recently asked how it will be possible to 3D print a model generated on the democratiz3D cloud service if the output model is too big to order printed. Embodi3D has a 3D printing service, but typically we cannot print models that are greater than about 40 cm in maximum dimension. There are a few options.

     

    1. Print the model at half-size. You can order your model printed at half-size, and we will scale down your part so that it will fit within the maximum print volume of our printers.

     

    2. Crop the input scan prior to processing with democratiz3D. In this option you reduce the volume of the input scan, so the output model file will be cropped. By cropping around only the desired anatomy you can exclude unwanted structures and reduce the volume of your model so that it can be printed. Here is a tutorial on how to do this.

     

    3. Crop the model after it is been processed with democratiz3D. If you have a completed model but it is still too big to print, you can download the model and scale, cut, or otherwise edit it utilizing mesh editing software such as Meshmixer or Blender. If you have your own printer you can then print the file directly. If you want to use the embodi3D 3D print service, you will have to re-upload the modified file. Click the Analyze Model link (see picture) and your newly uploaded model will be analyzed for print ability. Once this process is complete you will be able to get a 3D printing price quote and order your 3D printed model.

    analyze model.JPG


  3. It may be helpful to crop out the air around the body in the scan. This is dead space but still takes of file space. You can often reduce the file size quite a bit by cropping this out. Zipping the file will reduce the size, but right now democratiz3D cannot accept that file type.

     

    Hope this helps.


  4. Thanks for the question Mike.

     

    If your model is in the system, it is automatically analyzed for printability, including a size check. If it is printable, you should see a button "3D print this file" next to the download button, as shown in the picture below. If the mode is too small (less than 3 cm) or too large (greater than 40 cm), or has other technical constraints, it may not be printable and the print button will not show.

     

    If you have a question about a specific model that is now showing a button, please contact embodi3D via the contact form and someone will be back to you.

     

    Hope this helps

     

    Dr. Mike

     

     

    Screen Shot 2019-12-10 at 12.46.12 PM.png

     

     

     


  5. Inov3D has listed embodi3D as one of their best website for downloading 3D printable models. Of course, it is the only model sharing website that focuses on medical models in particular. If you don't know about Innov3D, it is a website that focuses on news and information related to 3D printing. They have product reviews, tutorials, and a variety of cool projects to become engaged in. Check it out!

     

    And a big shout-out to Inov3D for listing embodi3D as one of their top 3D printable model sites.

     

    Dr. Mike


  6. A member recently asked me this. I am posting my reply in the hopes it will help others.

    Question: "any advice on choosing a medical CT scan ? best practice for choosing CT for CMF and cardiac cases?  that I can give to our radiologist?"

     

    Answer: I wrote a blog article that explains all the details on how to select a great scan for 3D printing (link below). For heart cases in particular, try to find a CT scan with ECG gating. This will reduce motion artifact of the heart. Good luck!

    Dr. Mike
     

     


  7. I agree. Even with polyjet, there is the issue of wall thickness. The leaflets are very thin and thus hard to print with any printing technology. With great difficulty I designed an 3D printed a customized sheep heart for flow testing of TAVR devices using elastic material. 

     

     


  8. I've found that printing anatomic parts with a single extruder is difficult, primarily due to limitations on supports with complex, organic geometries. Dual extruder with soluble interfaces is what I use if FDM is required. Stereolithography is also an option although it is messier and arguably requires more postprocessing. Anyone have success with a regular single extruder (excluding specialized setups like MMU)?

     

    Mike

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