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3D modeling and printing from US data is pretty much the same as from CT... using treshold technique and generating mesh. The biggest problem, for now, is how to open DICOM data obtained from US because it differs to one obtained from CT in one of the software for sliceing (3D Slicer). For now, in 3D slicer you can open DICOM data from GE machines and Philips but people are working on enabling importing DICOM data from other manufacturers. Hope this helps a little bit

Agreed. This limit was put in place to prevent abuse for free downloads, but should not apply to paid items. We are working on a fix. You should now be able to download your files. Thank you for letting us know about this issue.

Dear olatif2 when in blender, choose edge select and then ALT + LMB/RMB (depending your preferences) and it should select whole edge (tabula externa) than try SHIFT+ALT+LMB/RMB and select tabula externa and than when both edges are selected pres F and sgould get a facet (closed gap). Or faster way would be to add a new object (cube), size it up, put it below both edges and boolean operation difference and should get closed edges of the skull but slightly lower model than it would be at first.

We recently 3D printed a multimaterial skull with MCA aneurysm from a CTA head for customer who needed the skull in rigid plastic and the vessels and aneurysm in flexible material. The model will be used by neurosurgeons to practice intracranial aneurysm clipping surgery. To properly simulate the surgery, the skull needs to be hard and the vessels elastic. Combining two materials (and two printers!) provides the best solution. The model was created on democratiz3D. You can learn more about embodi3D's printing service here.