This is a woodworking marking gauge, the only thing you will need to add is a 40mm socket head bolt and an hex nut. For the long body I suggest to use Brim to ensure the adherence to the printer bed.
The tool in the image is printed with a Prusa Mini + with Prusament PLA Galaxy black Filament.
I uploaded a V2 with 0 mark to help in the measurements, and it is now available with two body dimensions, 135mm and 240mm.
The author hasn't provided the model origin yet.