Summary

A height, angle, and position adjustable stand. Can hold a book, magazine, tablet, drink, or small plate. Extrusion used is 2020 V-Slot. I printed this in PETG.

Needed:
1.6 meters of 2020 V-Slot extrusion
4x 625ZZ bearings
14x M5 T-nuts
14x M5x10mm cap head bolts
2x M5x50mm cap head bolts (for pivoting joints)
2x M5x40mm cap head bolt (for vertical clamp and toothed pivot)
3-5x M5 washers
2 M5 nuts (standard)

2 Printed Nut Holders:
http://www.thingiverse.com/thing:641854
OR
http://www.thingiverse.com/thing:1177235

To build:
1) Print off all parts then clean up any brim or bridged sections. Clean printed holes with a drill if desired
2) Epoxy the two plate pieces together
3) Cut 2020 extrusion. I used to 50cm pieces for the vertical section and two 25-30cm pieces for the base.
4) Assemble the base with 10 M5x10mm bolts and T-nuts
5) Tap the top of the upper vertical piece to an M5 thread or drill it to 4.5mm and force the M5 bolt to cut it's own threads (use a bit of oil).
6) Press fit the bearings into the arms (make sure they go in square or the parts may crack). I used a workbench vise.
7) Press the two M5 nuts into the two printed holders as well.
8) Add the vertical section (see pics). Uses the remaining T-nuts and 10mm bolts plus one long bolt and M5 nut for the clamp.
9) Assemble the top section (see pics). Use 3-4 washers for the middle joint and one for the connection on top of the extrusion.
10) Bolt the assembly to the top of the 2020 extrusion with the tapped hole.

Optional:
To add stability I added some weight to the bottom by bolting on some steel flat bar to the 2020 aluminum. It requires flat bar, T-nuts, and the appropriate length M5 bolts.