The original design is based around a low cost 1kg calibrated weight like this (https://www.amazon.com/HFS-Chrome-Scale-Calibration-Weight/dp/B07HF3LXWQ), but a printable weight is included (fill to approx. 1000g).
It includes a “nut-scale” to judge drop heights.
WARNING: Use a chopping board to protect work surfaces!
The author marked this model as their own original creation.