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__o00_s00?ie=UTF8&psc=1
6' USB cable (1x)
https://www.digikey.com/product-detail/en/qualtek/3021011-06/Q366-ND/1531293
Cable tie holder (1x)
https://www.digikey.com/product-detail/en/essentra-components/FTH-40A-RT/RPC1328-ND/3811992
Hardware:
4-40 x 1/2" long socket head cap (2x)
8-32 x 1" long socket head cap (1x)
8-32 hex nut (1x)