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valchanov last won the day on January 20

valchanov had the most liked content!


About valchanov

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  • Birthday 06/22/1980

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  1. I prefer the design from the U.S. Department of Health and Human Services website. Prusa's face shield doesn't protect from particles from above, this one does. As a material, forget about PLA and go for PETG, 4 perimeters. PETG gives more sterilization cycles.
  2. The Empire strikes back. The company, which produced the original valves, is going to sue those guys for "patent violation", because the original valve cost 11000$ and the copy - few bucks. In my opinion, we deserve to extinct...
  3. Well, you can try with some respiratory machine valves. They literally saves lives in Italy.
  4. For this particular model, I used support on the build plate only and few small support enforcers for the overhanged parts of the big vessels. I also added a "box" support enforcer from the base to the level of the valves, because with support on the build plate only there is a small part of the aortic valve, which doesn't print well. With those settings, the entire athriums will be clean and the vessels will be steady. It requires to play a bit with the settings, but at the end the control over the support will increase significantly the results of the 3d printing.
  5. On every slicer there is a "support blocker" function - you can add a simple object and in the volume of it the support won't be generated. On Cura it was bugged the last time I checked, but on Slicer it works great. Or you can select "support on build plate only" and then to add few "support enforcers" on the big vessels, which is the more elegant solution. Anyway, at the end the big vessels and the ventricles will be a hollow shell.
  6. Version 1.0.0


    An aneurysm of the abdominal aorta in close proximity to horseshoe kidney. Postoperative model. Preoperative version. Due to the improved circulation (result of the surgery), the structures are with improved details, compared to the previous model.


  7. It looks shiny, but in my honest opinion, Philips are not famous with their software. They have notorious "fame" among the bulgarian radiological community as the worst software with the most non-user-friendly interface. My colleagues are all into Siemens and Esaote here. Besides, Slicer 3D is free, open source program. From the commercial ones, I really like Osirix and Materialise, but the best one in my opinion is Autodesk Within Medical. The price of 17k euro per year is a bit stiff, though.
  8. Well, this is not the first such experiment. This is the first 3d printed biosynthetic organism - a 3d printed Ray from rat cardiomyocytes, which reacts to light stimulus.
  9. Hello For a limited budged - Ender 3. Several of my colleagues and some students purchased such machines. An amazing printing right from the box. For minimum troubles and great beginner experience - Prusa MK3S. It's declared "the best 3d printer of 2019" for a reason. Fantastic learning curve and results. The new Prusa Mini also looks quite formidable. Those are machines with automatic features, which are quite useful. For professional settings - Ultimaker. It doesn't matter what kind of task you're trowing at it, it works and works and works. The minimum professional level machine. DLP for limited budget - Anycubic Photon or Elegoo Mars. They cheap, dirty and reliable. They requires an exposure to chemicals, but the printing is fantastic. STL - Form 3. The best in it's class. Because of it release, you can also purchase brand new Form 2 for 2k$, which was the best in it's class last year... There are also the 3D systems, Stratasys and similar corporations, but it's a whole different world there - the machines are fantastic. costs thousands of thousands and provides a quality, which is impossible for the low class, for which you're asking.
  10. It works with any Carthesian purging tower generating printer, which includes MMU2, Pallete2 and the 2-in-one hotends. There are config files for most slicers, Prusa Slicer and Cura included. I didn't tested it myself yet, but it looks quite promising.
  11. Version 1.0.0


    An aneurysm of the abdominal aorta in close proximity to horseshoe kidney. Presurgical model. The operation is ongoing. Honestly, I'm pretty happy with the result (and also the surgical team, which ordered the model). I printed it on Prusa MK3S, the kidney with the veins and the distal parts of the arteries with white Esun PLA, the aorta with red 3dJake Eco PLA, on 0,150mm layer height. The kidney is printed on 30% gyroid infill and 2 perimeters, with support on build plate only plus several support enforcers. The aorta is with 4 perimeters and 100% concentric infill, with support on build plate only and few support blockers. I glued them together with cyanacrylic glue and used a touch of red acrylic paint to make the glued parts more appealing. It took 300 grams of plastic and the printing time was 36 hours because of the kidney. aorta, aneurysm, horseshoe, kidney, presurgical, 3d, printing, celiac, trunk, vessels, mesenteric, superior, inferior, iliac, common, external, internal, abdomen, infrarrenal, organ, vascular, abdominal,


  12. A little update about the Clear PLA filaments for FDM printers. It's also considered Natural PLA, because it doesn't contains additives and colorants, which makes it a bit complicated for printing. It looks a bit transparent, but it doesn't have the optical properties of the glass - for fully transparent prints the STL and DLP are the right choice. The clear PLA is very susceptible to moisture and should be sealed in vacuum back, with silica gel. For the Clear PLA, higher temperatures are better for best results. The hotend temperature should be 220-230 degrees. Otherwise the adhesion between the layers won't be strong enough and the model will become brittle. I learned all of this the hard way... The clear PLA is an excellent material for vascular models. A hollow vascular model should be printed with 4 perimeters, 100% concentric infill and support from the build plate only. On the pictures below you can check why I prefer those parameters. Happy printing!
  13. I ordered this mechanism few days ago, the reviews for it are awesome. It's a retractable purging mechanism for printers with Prusa multimaterial and Pallete. Instead of generating a wipe tower, the filament change is performed on the mechanism. This increases the speed of the filament change and the entire build plate is free for 3d printing.
  14. Version 1.0.0


    This is my best selling model for 2019. Download, print, assemble, enjoy. Merry Christmas Originally modded as an engagement ring box, it became really popular birthday gift for the colleague from heart-related departments. I'm selling one of those models for 35$ I'm always bringing few, when I'm going on conference. Really nice gift. I'm printing those with Silk PLA. The metalic colors looks fantastic. I'm using several support blockers for the atrii, because this negates the artefacts and makes the whole upper part hollow. It requires some experience... Slice thickness: 0,15mm Infill: 30% gyroid Circular bottom fill pattern. Six neodymium magnets, 8x2mm. If you use too powerful magnets, the parts are closing so strong, that they can hurt someone. N50 are fine. cyanacrilic glue. Make sure you're gluing the magnets with the right poles!


    Really nice dataset. I managed to generate the head and part of the right upper limb. I made also a framed version of the model as a nice souvenir for your good work. Enjoy.
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