Wanted a reverse bowden adapter for Ender 3 S1. Remixed a model I found for some other Ender 3. Works decently well but it's not perfect. Added the yoke to increase stability during retractions but doesn't seem to do anything. Added the model files here incase anybody wants to give it a try.
The author remixed this model.
Added printed thread for pneumatic coupler. Increased compatibility for Ender 3 S1.