Marble Run with motor

Marble run with a 5V motor that can be powered by USB. For assembly, the screw holes for the motor cover need to be tapped for the 4-40 screws. The track, motor_cover, and lift_gear_backing_plate were designed in Fusion 360 and may need to be scaled 2540%
Parts used:
3/8" ball bearings (9x) https://www.amazon.com/gp/product/B007B2AG3G/ref=ppx_yo_dt_b_asin_title_o05__o00_s00?ie=UTF8&psc=1
5V motor with gearbox (1x)
https://www.amazon.com/gp/product/B074QQB95G/ref=ppx_yo_dt_b_asin_title_o02_