Bottle cage for kid bike with narrow frame

The bottle cage is suitable for 0,5 liter PET bottles which you could buy in a supermarket.

Due to low stiffness of PET bottles, the bottle cage is designed to work without clamping of the bottle. Other bottles with a bigger diameter fit also, but keep in mind maximum diameter is limited by flexibility of printed material.

For printing the part, I have added some joints between the left and the right side of the cage to avoid movement of the side walls. After printing, you have to remove the joints by cutting out. To place the part to the print bed, I added a plane surface to the bottom of the cage.

To fix the bottle cage to the frame, I have used the original screws of the bicycle which are cylinder screws M5.