This can hold your solder iron for you while you solder or what I use it for is you perfectly insert you heat set inserts in and you can turn it 90 degrees to hold your soldering iron as you solder stuff.

Materials needed 

around 300mm 2040 extrusion

v slot wheels x 8

flange bearings x 4  (5mm bore 14mm OD 5m tall )

Screws:

M5 by 25 x 2

M4 by 20 x 8

M3 by 8 x 3

 M3 by 25 x 1

M3 by 10 x 2

M3 by 6 x 1

M3 by 30 x  1