Shelf (free) stand

Designed this as a shelf free stand, which don't use too much space on my office desk.
It is expandable (with part 3) by 60 mm and can be also mounted on the desk or where ever you wanna mount it (with part 4).
You need M5 x 40 countersunk bolts and M5 nuts.

Each part should be fit on a 180 x 180 mm print bed.