This is a bike lock holder for the Hiboy S2/Pro electric scooter. It fits together by sliding one piece over the other and they are held in place by friction. It is designed for a Blackburn 9in bike lock ($9 from walmart) with an 18mm shackle but a step file is included to make changes depending on your lock.
I recommend PETG with 6+ perimeters for strength
The author hasn't provided the model origin yet.