rail spool system

my idea is to create a rails on the bottom of a shelf, on wich you can attach induvidual arms that can slide over the rails for different spools, and i am making a bowden motor mount on the same rails


notes:

Double sided arm challanging to print, I tried multiple orientations to print but didn't find a good way yet. Problem with vertical printing is strength of the locking parts so prefer printing horizontal

i use skate bearings. in:8 out 22