Schneider Dimmer Knob Replacement 4 mm shaft

The Knob for Schneider Atlas Design Dimmer with 4mm shaft. Was designed due to the caps were no longer kept firmly on the shaft after 3 years of usage, and their replacement was needed. However the caps on their own were not available at local store and the replacement of the dimmer entirely was not economically justifiable.
The project contains 2 models:

1. The Cap itself. Which can be printed and used instead of the original one.
2. The Insert. That can be used as to repair the damaged cap, by removing the damaged fixation with clippers and crazy-glue the insert instead, like shown on the picture.