Because my cat destroyed her cat-tree by jumping to hard and to often on it. The cat-tree is tightend between the floor and the ceiling, so after some years I had to replace one joint after another so that she can still use it.
When printing you need to pause the print at a layer of 18mm and insert a M12 nut which i took out of the old joint, the width of the nut shouldn't be greater then 13mm.
The outer diameter is 58mm so you better check if your tree has the same measurements.
The author marked this model as their own original creation.