Konstantin Kilgus shared on Thingiverse:
Self designed and face balanced golf putter with great play characteristics.
You can also lift the ball from the ground with this special design.
The model is designed with three cavities. These will be filled with tiny lead balls to add additional weight to the putter. You will need 180 grams of lead balls. Before filling them in, you need to drill the four holes and screw in two M5x10 mm DIN 7991 and two M4x8mm DIN7991 screws afterwards. The whole putter weights about 245 grams in total.