A 3d printed ball like in the OPs video would only be less than 3grams I imagine. Either way, the weight of the whip is hardly important right, as you are just

A 3d printed ball like in the OPs video would only be less than 3grams I imagine. Either way, the weight of the whip is hardly important right, as you are just doing an energy transfer from the falling weight into the small ball, the lighter the whip the better, as long as it doesn't break. If the whip is heavier, it will soak up the energy budget in momentum