The ball machine must be on balance to work properly, there is a few steps that have to be set this way to have the right weight.
File 1 : body machine including: (body, piston and bowl for the balls)
Layer heigth: 0.2mm
walls: 3
Top/bottom:3
Infill : 8 to 10% max
File 2 : including (counterweight and balls)
IMPORTANT : HAVE TO BE PRINTET AS A SOLID.
Layer heigth: 0.2mm
walls: 25
Print size :19.9 x 23,7 cm