As the diagram below shows, a prosthetic socket or device (P) may be covered by any type of surrounding or adjacent sheath (S), shell (S) or shield (S), for protective covering, for modified appearance of the prosthetic part (P), for art work display, in order to contain functional parts such as mounting mobile devices, to route control elements properly or differently or for other reasons.
The encasing shell (S) will be either from hard or soft material. The hard material may be configured in one piece, in a few or several pieces, or it may be built in a granular fashion from a very large number of hard parts, alternatively combined with soft parts or linkage parts. A soft material one might consider to use can be elastic or non elastic. One can also envisage a compound build for a sheath, to be made from both soft and hard materials.
The shell or shield or sheath (S) may be anchored to the prosthetic part (P), or to other parts of the sheath (S), or not at all. If it is not anchored, its mount may be stabilized by shape fitting of any kind. If it is anchored, the anchors may be hard or soft, elastic or non elastic, of a clip type or be constituted of screws or bolts.
I just post this because there seem to be ideas floating around for a while, that people use 3D printing, sewing of fabric or whatnot to add to their prosthetic limbs. And in order to get a fast economic overview of the options that are widely known and available, I decided to just outline it for everybody.
There are a number of concise instructions and experiences reported here: