FREECAD Basics

Object 1

I just followed the tutorial for this one and had to do it multiple times in order to get the hang of the software. I admit that I used the Youtube Tutorial for the final step.

Object 2

The desk in my room measured to be 1 inch long, so I converted it to mm (25.4mm) and used that length for the mouth of the object. Then, to hold the cord I created a pocket on the mouth.

Object 3

This first object receives the second object in the square pocket I created that is 5mm wide and tall.

This object is inserted into the previous object and and since the prong is a 3×3 square at the ends, it is able to enter the 5mm hole and rotate. The merging of the two objects would result in this prong making a U shape around the previous object. With the U in place, it is impossible for the two to separate without rotating the prong once more.