Modeled and created 3 of these in school project with a couple of friends. It snaps together with pins runs off a 9v and this motor many similar ones exist and is a 6-9v double shafted motor https://www.amazon.com/gp/product/B088TV1XT8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
use assembly 3mf to figure quantity of parts and how to fit together
3 perimeters 0.4 layer 20 percent infill
pins get like 60 percent infill
wobble wheel included if you want a different wheel
there is room for a toggle switch in the back if you want to add it.
pretty damm fast and scary
his name is Rueben
tolerances are huge like 0.5mm so anyone can print it
also rechargeable 9v works the best, this thing chews through the non rechargeable things very quickly due to high current loads from the motor
The author hasn't provided the model origin yet.