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valchanov last won the day on November 11 2018

valchanov had the most liked content!


About valchanov

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  • Birthday 06/22/1980

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  1. The cartilages of the larynx are one of my summer vacation projects. The raw data is from a CT scan and the nasopharynx can't be segmented properly. Eventually, I can segment the soft tissues as a bulk and the cavities as a separated mesh.
  2. Yep, they sent me the S version of the MMU2, instead of the regular one and the S upgrade for the printer for free.
  3. After 6 months of waiting, my MMU2 is finally on it's way. I'm planning to assemble it this weekend and hopefully, to run it right from the box.
  4. valchanov

    Winged Heart

    Version 1.0.0


    Love is in the air, so I made for you the perfect anatomically correct present for your medical professional lover. I added a set of lego wings model to Dr. Marco Vettorello's amazing heart model. For best coronary artery visualization, scale to 200%. 0,15mm layer thickness(0,05mm on the upper layers for better visualization of arteria interventricularis anterior), 4 layers of raft, automatically generated support. I printed it on Prusa MK3 with generic natural PLA. If you break the wings or the holder during the removing of the support material, use cyan-acrylic glue to fix it. I added some glaze varnish "for extra kick".


  5. Version 1.0.0


    A child with Treacher Collins syndrome - mandibulofacial dysostosis malformation after surgical reconstruction. Voronoi tessellation pattern added. Source of the CT scan - Phenix CT dataset from the Osirix Dicom Library This is a real challenge for your 3D printer, use water soluble support and lubricate your rails. The printing will be hard...


  6. This is why I'm not doing Electron Microscopy and SLA 3D printing - they are too hazardous. Besides, you can convert a simple FDM to print with biologicals and cells, but you can't convert any SLA printer to do the same
  7. There is a game changer on the SLA front - Josef Prusa made an open source SLA printer - Prusa SL1. You can buy two of those and one Prusa MK3 with the money for one Form 2. It prints down to 10 microns layer thickness (after some tweaking of the slicer). It is open source, which means that the wave of cheap prusa clones is coming. This will change the whole SLA sector because let's face it - with the money for one Form 2 you can buy a whole 3D printer farm with the best printer of Winter 2018 (Prusa MK3) or you can buy two printers of the same class, with the same parameters, which requires more tinkering and experienced staff. The bad side about the Prusa printers are the limited Wi Fi options...
  8. I decided to give my Prusa MK3 printer a real challenge, so I cut my best skull model, I added some slots for neodymium magnets and I started to print the parts. I'm done with the half of them and I'll update my post when I'm done.
  9. The build was easy, there are no parts which requires soldering. The manual is really good and helpful, the Haribo candies also helps a lot. The cable assembly part is a tricky one, I asked a friend from the Tech university for some help, but at the end I assembled them by my own and my friend just ate my extra Haribo package (and also ordered a Prusa MK3 kit for himself). You have to be sure that you're building the printer at the flattest and most horizontal surface available - the belt assembly and calibration part are the most important steps and if you do them correctly, you won't have further problems with the printer. The software is very good - Slic3r Prusa Edition is a freeware and have a lot of advanced features, advanced support material management included. When I started to edit my layers manually, the quality of the prints was increased substantially and I made some impossible prints. The whole kit deal is really good one - you can't find printer with the same effectiveness at the same price, it's an out-of-the-box experience and requires a simple build, which will make you familiar enough with your new printer in order to maintain it properly. If you're living in USA, you can order the Seemecnc Rostock Max printer - it's an excellent delta printer with 32 bit controller for 1000$. The reason I got Prusa are the custom taxes - Rostock comes to Europe two times more expensive and Prusa is the better deal. I hope that after the Trump nonsense I'll be able to get one...
  10. The last three weeks was a busy time for me. I purchased the best 3D printer of Fall 2018 - Prusa I3 MK3. I ordered it as a kit, the build itself took me 8 hours - my obsession with the electronics payed off - and immediately after that the printer was ready for some action. Prusa I3 is the most common 3D printer in the world - 70% of all printers are Prusa clones. Prusa MK3 is manufactured by the designer of the printer itself, Josef Prusa and most of it's parts are made by other MK3's in the Prusa's 3D printer farm. The printer is robust, tough, with very useful automatic functions and can print with most types of termopolymers (Polycarbonate included) with minimum layer thickness of 0,05 mm. Now I'm preparing an enclosure with automatic temperature and humidity control, Hepa and carbon filter and Octoprint upgrade for WiFi control. I bought cheap secon-hand server rack for this purpose (Fig. 4) - if it can keep a constant environment for the servers, it can do it for my printer, right? y first print was the object on Fig. 1 (what is the name of the organ?) Then I had more than 300 hours of unstoppable 3D printing and the printer doesn't made A SINGLE bad print. The only issue was the printing surface after print #12 - the next print didn't adhesed properly, so I had to wipe the printing surface with isopropyl alcohol. I was printing with PLA, now I'm starting with the first roll of PETG. My next step was to contact my colleagues from the orthopedic surgery clinic and to show them my first prints. They was exited by the result, so they provided a 1 mm. slide thickness CT scan of a Pylon fracture. Then I used the following workflow: 1. Slicer 3D, Resample Scalar Vollume to resample the set to 0,5 mm. 2. CurvatureAnisotropicDiffusion with 3 iterations. 3. Editor module for segmentation, model maker for the conversion to stl. 4. Autodesk Meshmixer for remeshing, editing and sculpting, Blender for smoothing. I prefer Meshmixer than Zbrush because it's much simpler and user-friendly. I'm also pretty good with it 5. I sliced the final stl with Slic3r, Prusa Edition and sliced the model on 0,150 mm slices, with support from the building plate, with 15% Gyroid infill (it looks exactly as a spongy bone), with Natural White PLA (17 euro per kilogram, from a local supplier) with the Natural PLA preset on the slic3r. 6. The print took 14 hours, the support was easy for removal (Fig. 2). 7. The orthopedical surgeons did their magic, first on the model (Fig. 3), then on the patient. They claimed, that the operation was very successful, thanks to my model and their skill. The chief surgeon is Dr. Preslav Penev MD PHD. My second project was a Pilon fracture of the ankle with multiple fragments, which I made with the same workflow. The patient is in operation right now. I also have two more projects, for a congenital aplasia of the talus with pes varus and for luxatio of the Lisfranc joint, so I hired two medical students and I'll teach them how to model (I already sent them Dr. Mike's beginners tutorial) for my future projects. I'm the first physician in Bulgaria, who performs preoperative 3D printing, which is very good for my career development. My colleagues called me a "pioneer" and I'm thinking about a 3D printing lab. I already ordered the Multimaterial Upgrade, which means SOLUBLE SUPPORT MATERIAL (I have to wait till January, it's in production right now). Jo Prusa's STL printer looks quite appealing too. Those printers are ridiculously cheap, considering how efficient never-stopping beasts of burden they are. I guest I should hit the vascular surgeons next...
  11. Version 1.0.0

    1 download

    Panoplosaurus, “completely armoured lizard”. Skull from CT scan. Link to Sketchfab. Owner of the CT scan is Ohio University.


  12. If you are a small scale operator (1-2 FDM printers) and you need cheap and reliable solution for your filaments, then you can check CNC Kitchen's Fiament dryer guide. You can easily use it directly or you can install it on any type of enclosure you're using. All you need is an Ikea plastic box, two bowden connectors,, a PVC tube, a teflon tube and some filament for the 3D printed parts. The cost is under 40 bucks.
  13. Version 1.0.0


    An infant with proximal fracture of the tibia and external fixation. Source - Nukki BlastInjuri 1.0.0. Link in Sketchfab. Osteology, orthopedy, orthopedic, fracture, tibia, fibula, leg, external fixation, osteosynthesis, bone, 3d, model, .stl, printable, lower, limb, femur, condyles, lateral, medial


  14. Version 1.0.0


    Talar fracture. Source - Hristo Hristov. Link in Sketchfab. Excellent model for orthopedic training - just print it in PLA and have some fun anatomy, orthopedic, orthopedy, bone, talus, calcanus, foot, training, osteology, naviculare, phalanx, cuboideum, cuneiform, tarsal, metatarsal, fracture, .stl, 3d, model, printable, lower, limb, ankle


  15. Version 1.0.0


    This is my version of the Phenix CT dataset from the Osirix Dicom Library - an infant with Treacher-Collins syndrome and aplasia of the left zygomatic bone and maxilla after a reconstruction surgery with an autograft. I wanted to preserve the small details of the maxilla and the nasal cavity, so I segmented them manually. It took me a week. The spine is not done yet - I'm redoing it and I'll reupload the whole set in the following week. The model is 3D printable, but you'll need a multi-material extruder with soluble support for this purpose - PLA/PVA will be best (PLA/PVA is much better than ABS/HIPS in my opinion). I hope you'll enjoy it skull, face, 3d, model, printable, skull, skeleton, bone, ct, scan, maxilla, malformation, reconstruction, surgery, autograft, zygomatic, arch, fracture, craniotomy, stl, temporal, frontal, parietal, occipital, mandible, nasal, orbit, cervical, spine, clavicle, ribs, thorax, 3d, model, printable


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