Belt Tensioner Carriage for Duet3D Delta Smart Effector PCB Carriages

Remix of a belt tensioner carriage when using Duet3D Delta Smart Effector PCB Carriages and robotdigg linear rails. Made it slightly bigger and more sturdy and removed rod mounts which are provided with the PCB carriage.

There's one version of the tensioner for a standard M3 nut, and another for a press-in stud that makes fitting easier