This is a fly tying Bobbin Rest, for my vise its 10mm to short & doesn't weigh enough, my next step will be to print it without a bottom so i can fill it with plaster or something else heavy that sets like cement.

Just clip one of the them little metal sowing machine bobbins onto the post & clip the upright into the base.

Supports used only for the back of the face where the small Bobbin clips one