Working with my students with VEX Robotics, we are constantly dealing with the separation of the push pins. this tool is so handy at doing this. I just got tired of breaking nails. I found it better to have the push pin head to the inside of the tool and separate and the two pieces will just fall into your hand. I am going to do another upgrade to this that will have a box to catch the pin.
I printed 100%, you possibly can go less
Going from Inventor to Cura, the scale is small, but I found that scaling x, y, z to 1000 will put it back to original size.