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Since I don't know how to make 3D pieces, I can only use the ones others are making available. I just brought up some examples of other pieces it would be good to have 3D images of, and I used Cavalier Chess as a context for mentioning them.

Well, you know what they say, beggars can't be choosers. ;-) None of us here really knows how to make 3D pieces. I now have a way to generate pieces that consist of cylindical or conical sections, possibly reoriented, but that is all. Making something like the Knight is totally out of the question. The Knight-like pieces shown in that display were all created by distorting the existing Knight with the aid of a computer program that read in the list of vertex coordinates and then applied a geometrical transform to it. (Like shifting it upward, or in the case of the Nightrider applying a shear transformation.) And then distort the pedestal by hand-editing some of the vertex coordinates at the base. So of course they look very similar.

I will probably upload the tool I made for creating the tube-like pieces, so everyone can use it. It is not difficult to use. Just tedious. You have to edit a list of ring heights and diameters that defines the shapes, generate the piece, copy the files to the Jocly library (for which I use a small shell script), make the browser running Jocly with a game that uses the piece reload the new files and the game, so you can see how it looks. And then tweek it to remove the things you don't like. Rinse and repeat, ad nauseam. If you started drawing the cross section of the piece on millimeter paper it probably doesn't need too many iterations before you get it right. It helps to create a Jocly game that shows the piece in a place where you can easily zoom in on it, without first having to move pieces around to get it there.