The adapter locks to the Cybex Aton S2 car seat (possibly any other Cybex car seat) and also to Jané Crosswalk Formula Transporter. Adapters can be used in both orientations.
Print settings
Printed using a 0.4 nozzle. Supported lower part of model as shown in green, but supports may not be required depending on printer / settings. Print flat as provided so that layer lines go through both locking mechanisms which makes part very strong.
(If not using provided .3mf just mirror the file on X axis inside the slicer to print the other side)
Disclaimer
I take no responsibility for the safety of your child. Use at own risk.
Feel free to use attached Fusion360 model to improve the design and or fit the Cybex car seat to other strollers.
The author remixed this model.
reused cybex lock part and modelled custom bottom part.