IKEA RÄCKA Curtain Rod Insert

IKEA RÄCKA Curtain Rod is extendable and has 2 end-caps on both sides.
I had to cut my rod to some smaller sections to cover more windows on different walls.

In order to screw the Raffig finals, I needed to print the inserts for the rod.

The inserts have some ribs that are used to stay in place, once they are pressed in the rod. 
The fit is tight, so you might want to use a hammer :)

I printed it with PLA, but PETG or any other material would also work.