This is a remix of dc42's design.
My carriage hat too much flex so i designed it much stronger and with MUCH smaller tolerances.
Additionally this takes the 2.1mm thick carriage adaptors into account which are added for the smart effector.
Attach V-Rollers with one washer only, no need for a nut.
I noticed the screws had play in their hole and would bend slightly because of the long lever due to the long distance to the rollers. So tighter tolerances and a single washer should improve this.
I suggest printing with PLA, as other matierials like ABS and PETG are much more flexible.