They are printed by MOST Delta 3-D printer http://www.appropedia.org/Athena_Build_Overview I used openSCAD to design all parts. PLA 1.75 mm Hatchbox Fill Density 30% print speed 30 (mm/s) Layer height 0.2 (mm) shell and bottom/top thickness 1 (mm) Need to print - two for a corner top - two for a corner bottom - two for bar connector v2 - two for bar connector v2-1 you may print screw from this link http://www.thingiverse.com/thing:193647 Need - 1 meter of ribbon - 4 for M4 x 45mm socket head cap screw - 2 for M4 x 25mm socket head cap screw How to use flexible tablet hanger - use the ribbon to tie all four corners together or - use connector to connect between left and right corners for top and bottom - use ribbon for hanging