This is a model of the skeletal structure of hands based on a CT scan. Its available to download for free here from myminifactory’s Scan the World project: a global depository of free 3d-printable sculptures, biological models and cultural artefacts that have been created using 3D scanning technologies.

Supports were required because the organic shape doesn’t sit flat against the print bed, and also to support the hollow metacarpals and forearm bones. I used the same white PLA material for the print itself and the supports.

The hand was printed at a resolution 0.12mm (fine). I often slice the model for printing in layer heights that are multiples of 0.04. Message boards quote this as the “magic number” layer height for the Ultimaker S5 model 3D printer; they are referring to 0.04 being the minimum stepping distance for the Z-axis motor. By using this number I’m hoping to improve the consistency of each layer’s height, even though the benefits might be subtle.

Scan the World is one of the best resources available to amateur 3D printers. The scans of statues and animals are quite precise and detailed and can be printed at any size. The anatomical models can supplement hands-on education. Local artwork, buildings and monuments can be printed as souvenirs.