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valchanov last won the day on January 30 2017

valchanov had the most liked content!

About valchanov

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  • Birthday 06/22/1980

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  1. Intellectual property protection

    I shared one of my models with an acquaintance of mine, because he wanted to test his new Prusa 3D printer with it. Later he posted it on a website for selling. I approached the problem personally, he removed the model from the site and apologized to me, this is why I won't share details about the issue (he had to print some of my models for free, of course). Now all my models are watermarked and if I have such a case, I can contact the administrator instead, my name and my institution are inserted in the mesh itself.
  2. Intellectual property protection

    The protection of the intellectual property of the 3D models can be a serious issue for every 3D modeler. It sucks when your model is posted for selling at a webside without your consent with a juicy price and you're gaining NOTHING from it. Some 3D artists are adding watermarks to their models, which can be easily removed by an amateur with a free surface modelling program (Meshmixer, Meshlab etc.). But there is an easy solution for this injustice - an invisible watermark. On Watermark3D you can add such watermark, incorporated into the mesh of your 3D model itself, which is hard for removing and can be checked on the same website during an intellectual property dispute. For the removing of the watermark you have to remesh the whole model, which will decrease the overall quality of the model substantially. I hope that I'll spare you the pain, which I experienced recently. Enjoy
  3. Fancy skull and vertebrae

    Version 1.0.0


    This is 3d model of a skull - my best skull so far. I made it from 0,7mm CT scan. This is the source model for my paranasal sinuses model. Sketchfab link. Thanks for the tutorials, Dr. Mike!


  4. Paranasal sinuses

    Version 1.1.0


    The paranasal sinuses model for 3d printing. CT scan, 0,7mm slides, bone window. The model is without scaffolds and you should add some with your slicing software. Link to sketchfab: Paranasal sinuses


  5. Version 1.0.0


    Acetabular fracture of the pelvis. CT scan, 2mm slides. Pelvix set, Osirix dicom library. link to sketchfab: Acetabular fracture of the pelvis


  6. Atlas and Axis, 3D PDF

    I used a 3d pdf generator (pdf3d reportgen) and it has an option to convert several models (I used obj) into a document with a model tree.
  7. Yes, it can. You can check this link for details:
  8. Atlas and Axis, 3D PDF

    Hello My recent anatomy projects forced me to start importing my 3d models into 3d pdf documents. So I'll share with you some of my findings. The positive things about 3d pdf's are: 1. You can import a big sized 3d model and compress it into a small 3d pdf. 40 Mb stl model is converted into 750 Kb pdf. 2. You can run the 3d pdf on every computer with the recent versions of Adobe Acrobat Reader. Which means literally EVERY computer. 3. You can rotate, pan, zoom in and zoom out 3d models in the 3d pdf. You can add some simple animations like spinning, sequence animations and explosion of multi component models. 4. You can add colors to the models and to create a 3d scene. 5. You can upload it on a website and it can be viewed in the browser (if Adobe Acrobat Reader is installed). The negative things are: 1. Adobe Reader is a buggy 3d viewer. If you import a big model (bigger than 50 Mb) and your computer is business class (core I3 or I5, 4 Gb ram, integrated video card), you'll experience some nasty lag and the animation will look terrible. On the same computer regular 3d viewer will do the trick much better. 2. You can experience some difficulties with multi component models. During the rotation, some of the components will disappear, others will change their color. Also the model navigation toolbar is somewhat hard to control. 3. The transparent and wireframe polygon are not as good as in the regular 3d viewers. The conclusion: If you want to demonstrate your models to a large audience, to sent it via email and to observe them on every computer, 3d pdf is your format. For a presentation it's better to use a regular 3d viewer, even the portable ones will do the trick. But if the performance is not the goal, 3d pdf's are a good alternative. Here is a model of atlas and axis as 3d pfg: Best regards, Peter
  9. Version 1.0.0


    This is a 3d printing version of my "Aortic arch with bicarotid trunk anomaly" 3d model. It's hollow and with proper supports, it can become a decent 3d printed model with 0,2mm or lesser layer thickness.


  10. Bovine Arch

    Version 1.0.0


    This is 3d model of aortic arch with left common carotid artery, which branches from the brachiocephalic trunk (Bovine Arch) and a dilatation of the ascending aorte. I made the model from the Artifix CTA set, Osirix dicom library. It's part of a anatomical series of aortic arch anomalies and it's for clinical anatomy teaching purposes.


  11. Aortic Arch, type III elongation

    Version 1.0.0


    This is 3d model of aortic arch with type III elongation (according to Madhwal classification). I made it from MRI set, which I obtained from Osirix dicom library, Felix set. It's part of a anatomical series of aortic arch anomalies and it's for clinical anatomy teaching purposes.


  12. Version 1.0.0


    This is 3d model of aortic arch with bicarotid trunk anomaly and aberrant right subclavian artery (arteria lusoria), which was made from CTA scan. The patient is caucasian woman with stenosis of the left vertebral artery (which is not included) and severe disphagia. It's part of a anatomical series of aortic arch anomalies and it's for clinical anatomy teaching purposes.


  13. Hello This is my first 3D print. I used a 3D model of a kidney, which I made myself from a renal angiography. I printed it with one of my engineer geek friends using a Prusa i3 self-made 3d printer, 0,2 mm nozzle, 0,2mm layer thickness and PLA as material. This was my entering demonstration, which gave me an assignment as a freelancer anatomy assistant professor. My ambitions are to use 2D and 3D models, along with the traditional cadaver techniques in my work as an anatomy teacher and to teach my students how to do it with their own hands. I have 12 years of experience as an internal physician in ER, 4 years as a psychiatrist, 3 years as an acupuncturist and a lifetime as an IT GEEK, I don't have any teaching experience, my english language skills are a bit rusty and I don't know what will come from this, but I'm eager to find out. Wish me luck:)
  14. Kidney Hydronephrosis



    I made this kidney from a Renal Angio 64 detector CT of left kidney obstruction. I downloaded the DICOM dataset from the Osirix free library (, CENOVIX dataset. This is my first try, I don't know if I managed to do it right, by I like it anyway. I hope you'll like it too


  15. Version First edition


    After one week of practicing with dr. Mike's tutorials, I was able to create 3D model of pyramidal neuron from 10gb CLSM (confocal laser scanning microscopy) Tiff slide. I almost burned my video card, but in the end I done it First I used Fiji to convert .tiff slide to binary (Process/Binary/Make Binary). Then I used Dilate function to reduce the size (Process/Binary/Dilate) and I cropped one of the most promising neurons (Image/Crop). I saved my stack as a .tiff and I used 3D Slicer to create volume (Volume Rendering), to convert it to label map and to export it as .stl. Finally I used Meshmixer to remove the artifacts, to decrease my triangle budget and to add a mild smooth effect. The result is here. I hope my experience will help you in your future projects. I'll create video tutorial as soon as I can.