They are printed by MOST Delta 3-D printer http://www.appropedia.org/Athena_Build_Overview 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 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