Kossel (Delta): small detachable linear motion carriage with bearing 623-ZZ (3x10x4mm) for 2020 extrusion

This is a (working) work in progress, because of upcoming docu.

Basically a rework of https://www.thingiverse.com/thing:2854414

features:
- detachable so you don´t need to disassemble the kossel frame
- smaller footprint

you will need quite a lot of m3 screws and lock nuts.

make sure that:
- before start screwing everything together: insert all nuts and check their orientation!
- you might even secure the nuts either with the supplied caps/inserts and or with some tape
- you gre