Super fun, completely harmless!  Prints easily and quickly.

Assemble by snapping together the base and (2) guides.

Attach string (paracord gut) to weight and weight to blade and insert into uprights (guides).

Ball is fixed to end of string to retain everything.  Be sure to thread rope guide onto string before fixing ball in place.  

Snap on the top and set/super glue the guides on one side, careful to set them where the tension looks best and blade has full travel - then glue the bucket wherever you think it looks good.....Have FUN!