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valchanov

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Everything posted by valchanov

  1. - Is it typically a requirement to have latticed internal volumes to reduce material costs? In my experience, the model have to be solid and without internal meshes. The material cost can be controlled with the percentage and the type of the infill. - What about dowels/pins so that the model can be assembled? Do people usually want this? If you're printing a bone model in two parts, its better to glue them together after the print. If you're printing a model with a important cavity (skull or aorta), pins or sockets for neodymium magnets are a choice, which guarantees good alignment for the parts of the model and increases usability. The magnets are better, unless your client specifically prefer pins. - Are there any other considerations that would make these models more valuable to the community - I potentially have a few more anatomies that could be of value. Make them shinier, more stable and design a stand for the model.
  2. In order to go around this issue, I'm using the following technique: - First I'm making a segmentation of the main structures of interest. - Then, I'm exporting the segmentation and removing the unwanted parts with a surface modelling software (Meshmixer). - Finally, I'm reimporting the model as a segmentation and I'm using it as a mask with threshold techniques. Sometimes, I have to export/import a segmentation multiple times, but this helps me to model even the smallest and most impossible structures. Here is my latest work - a liver with a multiple necrotic lesions and vena cava. About the software - Slicer 3D is better than inVesalius because it have more powerful options for denoising, normalization of the dataset and analysing tools. inVesalius is shinier, prettier and easier for work though.
  3. 1. The first one is a shell, while the other one have a margin of 0,2mm, which makes it suitable for SLA or DLP 3d printing. 2. The one at sketchfab is the shell version.
  4. Its nice, because most of the upgrades are already installed. You can install the auto bed leveling sensor, to make the printer complete. You can also consider an enclosure, if you want to print ABS without warping.
  5. You can order it from banggood.com Ender 3 pro costs 199$ and can be delivered from CZ, I already ordered one. I would recommend Ender 3 V2 though
  6. There are good animal CT scans on Duke University's repository. There are also a lot of stl models, tif's and all kind of media content you can possibly want. Just don't forget to quote them, this is an intellectual property... OR you can make a CT scan of a rabbit and segment it into a 3D model by yourself or you can hire one of us to do it. THEN the intellectual rights will be yours. If you want just to download a rabbit skeleton and to 3d print it, go for the Duke University. I am really excited by their Ape and Hominin collection - already 3d printed few of them. The dinosaurs are also really good.
  7. Pretty much the same. But there is a new player in town - the Snapmaker. 3d printer, laser engraver and CNC rooter in one machine. I don't have personal experience with it, but it looks so appealing... Almost too appealing.
  8. The temporomandibular joint is extremely complicated one, a simple hinge won't simulate the movements in the axes properly. A whole system of hinges and strings is needed. For simple demonstration purposes, the neodymium magnets works great.
  9. The generation of the lumen of the vessels is not a problem, the adventicia is. But the lumen is quite accurate - 1 voxel average deviation. The adventicia - depends on the presence of calcifications in it - which is quite often during AAA.
  10. Ender 3's bigger bro, Creality CR-10 is better in any possible way - huge building volume (300-300-400 mm), better controller, better extruder and hotend, double Z axis, safer power supply... I bought my CR-10S on Black Friday for 320$... I'm not printing on it often - my other printers are much better and more expensive. But for small operation, Ender 3 and CR-10 are quite good. There are 3d printing farms with those printers and they can be very reliable after some hardware upgrades and tunning.
  11. valchanov

    spinosa

    An excellent dataset, with 1,25mm slides and no contrast. Currently, I'm segmenting the soft tissues of the nasal cavity, which is quite symmetrical and somehow elongated, with gigantic processus uncinatus. I'm planning to model the soft tissues and the bones and then to upload the model at sketchfab for the medical students.
  12. This is a model of the skull, with most of the foramens on the basis cranii and highly detailed nasal cavity. I made the same dataset also into a soft tissue model. I didn't include the inner ear. It's purpose - surgical training, engineering benchmarks, CFD analysis, that kind of things. I'm selling it for morphological studies and, I'm proud to say, it's quite good the task. I can make a highly realistic model of your skull, heart, pelvis or whatever organ/s you like. but it will cost. If you give me your MRI, I can make the brain too...
    It's a nice birthday present for an anatomy department head and I'll use it exactly for this.
  13. Prusa slicer is not hardware-specific and can be used with most Cartesian FDM printers. For example, there are tons of videos in youtube how to set Ender 3, CR-10, Anet, Tevo and similar low-class printer to work with the full extend of features, which comes with Prusa Slicer. The only issue is the retraction speed - the bondtech gears of MK3 are 3x and the retraction have to be set accordingly. I can't run my Rostock max with it, because it's delta printer and I'm using Cura. Btw, our lab with be updated with Form 2, because of this Aortic valve TAVI simulator - I made the 3D model and ordered it to be printed with Elastic resign on Form 2. The model is excellent, everyone is happy, my lab will get a brand new Form 2 for serial printing of those things...
  14. Not a word about Prusa Slicer - maybe THE BEST slicer so far, frequently updated and user-friendly. Maybe Simplify3d has more useful options and extras, but it's not updated regularly, so in my opinion, it's number 2 after Prusa Slicer. The best slicer is Netfabb - an Autodesk program, which combines design, simulation and CAM in one and can do amazing stuff with basically everything (I'm talking about alchemy level stuff). The price is too hefty for my operation, though. Did you know, that you can use the latest version Fusion360 as a slicer? I was also surprised. It's actually not bad at all, but I prefer Prusa Slicer and Cura for my printers.
  15. Version 1.0.0

    101 downloads

    I generated this model for cardiosurgical training simulator. I used the Obelix dataset from the Osirix dicom library. Those are the the raw 3d models of the thorax and the heart. I used those to add two mini invasive accesses to the right and a table for pig hearts in the mediastinum with the shape of the diaphragmatic of the heart. I took 2 kg. of PLA and more than 200 hours of print, sliced into 10 separate pieces and glued with cyanacrilate glue. It's quite resilient, the floating ribs are quite breakable and I don't recommend to print them. I'm adding here the raw files, because I don't know what kind of access you need on the thorax. The printed thorax can be covered with vinyl or leather for extra realism. anatomy, thorax, 3d, printing, simulator, chest, .stl, 3d, model, printable, ribs, sternum, cartilage, dorsal, spine, transverse, body, intervertebral, disc, bone, ventricle, auricle, mediastinum

    Free

  16. I used this version. PETG/PET, chemically resistant face max.
  17. 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.
  18. 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...
  19. Well, you can try with some respiratory machine valves. They literally saves lives in Italy.
  20. 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.
  21. 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.
  22. Version 1.0.0

    0 downloads

    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.

    $25.00

  23. 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.
  24. 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.
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