Scalable pulley with 623-ZZ bearing

Print one of each files!! They look the same but they are not.
( Little mistake designing :P )
You will need ball-bearing 623-ZZ 3x10x4 per each pulley
2 nuts and 2 screws M3 , the long depends how many pulleys u need in a row.

Use 1, 2 , 3 ... all pulleys u need for your proyect