This model is designed for use in combination with https://www.printables.com/model/236805-tevo-tarantula-x-rail-support-brackets
It mounts to the other side of the 4020 extrusion (with 4x M3x8) and then mounts through to the motor. It has the option to support the motor shaft using a 685ZZ bearing.
The author marked this model as their own original creation.