I could make a gizmo that would give more accurate measurements but these are close (I did use a caliper). Sorry my caliper is not metric... The number are the distance in inches that the ball on the tool side of the tool changer plate sticks out past the exterior face of that part. The numbers are looking at the plate from the front of the printer. The first number is the top ball and then the lower right then lower left. Tool 0: 0.103" 0.105" and 0.125" Tool 1: 0.157" 0.112" and 0.102" Tool 2: 0.109" 0.112" and 0.11" Tool 3 0.12" 0.13" and 0.133" Here is a picture of tool 1 I removed the stepper motor and did a tool installation on the tool changer and rotated the shaft by hand to get a sense of the torque required to turn it to a fully locked position. Tool 0 and Tool 2 took what I felt to be a reasonable amount to expect from that stepper motor. Tool 1 was definitely more difficult to spin and tool 3 was easier than tool 1 but I felt like it would eventually create issues. I have a replacement stepper motor coming but I am a little concerned that tool 1 is going to put too much stress on the new motor. I did look briefly at similar threads but I wonder what the opinion is about pushing the balls into the tool plate myself? I did not find any information on that specific issue. I have a couple different options for using a press to do it but I am not sure what risk this poses to ruining the tool plate? If I could get all of my tool plates to be fairly close to what I have on Tool 0 I am fairly confident that the drive system on the tool changer will have a long prosperous life.