Tama marudai weighted bobbin

I made a hollow Tama bobbin for my wife so that we would wight it by filling it, in this case with sand, it is about ~23 grams, with steel bbs is hits about ~52 grams.

I designed after the traditional wooden Tama bobbins used on a standing marudai to make kumihimo rope. just print it then fill it with anything really and super glue the cap on.