1 pointIf you want to print flexible materials on an fdm printer you should only use direct drive and not Bowden systems (like Ultimaker). So the path between the extruder gear and the hot-end should be as short as possible. Especially if you want to go below shore hardness 85A. Printing speeds should be very VERY low (start at 10 mm/s, maybe you can go faster but start slow). And retraction should be a lot higher (at least 2 times higher). Another thing is that flexibles are sometimes VERY hard to take of the printing bed (maybe try something like blue masking tape).
1 pointThere is a histological staining technique for bone tissue, which can be used with confocal microscope for detailed dataset of the haversian model, the lacunae, the canaliculae, the perivascular spaces - every detail you can possibly imagine. Then the dataset can be segmented into a 3D model with the same workflow, which is used for the CT datasets. The problem is that this technique is very demanding, expensive and potentially letal because of the chemical, which are used in the process. I made several models of pyramidal neurons from confocal datasets (here is one on sketchfab, I have another on embodi3d with the dendrite spikes on it) and it's not that bad - after some deconvolution you can segment the dataset with the automatic threshold segmentator or even with the grayscale model maker and you'll get a good model. Sadly, my department didn't received the funding for this technique and I don't have such dataset...
1 pointembodi3D doesn't host DICOMs because they aren't anonymized by default and there is a risk of inadvertent sharing of patient information. The NRRD format is anonymized and thus safe to share online. If you are using 3D slicer and want to manually extract the bones, you can do so easily with NRRD, which kopachini has already sent you a link to the extensive femur scan library. 3D Slicer can process both DICOM and NRRD, with the only difference being time to load the scan (DICOM is slower). Of course, if you DON'T want to manually extract the bones you can send the NRRD file to the democratiz3D service on this site, and it will generate a 3D printable model for you in about 10 minutes. Just another option for you to consider. Hope this helps. Dr. Mike
1 pointTry the segmentation module in 3D Slicer. You can exclude the mediastinal fat (low density) and contrast enhanced blood (high density) to only capture the myocardium. It takes some practice but with some trial and error, you can do it. I'll put creating a heart segmentation tutorial on my list of things to do.
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