Original part looks like this: Shotgun Pro Seat Headset Spacer – Kids Ride Shotgun EU
Shotgun Pro Child Bike Seat - Kids Ride Shotgun – Kids Ride Shotgun EU
Spacer/adaptor for Kids Ride Shotgun Pro seat
This 3D model is a spacer/adapter for the headset tube that is used to mount the Kids Ride Shotgun Pro child seat. It is designed to be used with bikes that have a 1 1/8" steerer tube.
Disclaimer:
The use of this 3D printed product is at your own risk. It is important to consider the printing material structural stress and quality of the print when using it. I assume that the original part is made from some kind of composite. I do not have extensive experience with 3D printing, but if someone needs it, they can use the model and dimensions.
The more of these washers the owner has, the less complicated the reassembly will be when mounting the child seat to another bicycles.
The author marked this model as their own original creation.