Lego compatible Shock Absorber

This is my shock absorber for Lego Technic models.
I chose a spring with 24mm normal length and 11,5mm travel.
After Printing you probably have to drill the holes to make them exactly.
On the side with the spring, drill the hole with a 2mm drillbit.
Then insert a steelrod with a diameter of 1,5mm on the other side.