Educational conveyor belt with DC motor

I prepared this conveyor belt for my students to conduct lessons with Siemens PLCs and adapted the original to a 24-volt DC motor

I made the conveyor belt 60 cm long + 10 cm for the two ends, with three parts plus infrared sensor holders and a solenoid holder for ejection

here

a demo video

Idea and much of it comes from
https://makerworld.com/it/models/1909125-modular-t-slot-conveyor#profileId-2047052

Materials:

24V DC Motor 77 RPM
https://it.aliexpress.com/item/33011233885.html

Ejection electromagnet solenoid
https://it.aliexpress.com/item/32731717962.html

IR PnP 24V Sensor
https://it.aliexpress.com/item/1005009885758929.html

M3x 10mm, 16mm Screws and Nuts Kit
https://www.amazon.it/dp/B0DBZ9TTL1?th=1

M3 T-Nuts Kit
https://www.amazon.it/gp/product/B097NSN12M/

Optionally:
4 R8-2RS bearings