The hairpin is slender, to avoid unsightly layer lines and misaligned prints caused by excessive thinness and height. I have divided the rod into two sections and reinforced the connection with a pin.

The hairpin can be used with my previous hair crown or separately.

When printed at 100% scale, a 3mm diameter pin is used for connection, at least 20mm long, longer is fine, it will also be heavy and have a feel, glue is needed for connection, other scales can be calculated accordingly