This is a modified version of mattschoenholz's "Easy adjustable Rostock/Kossel J-Head Mount". After printing mattschoenholz's version I realized that the holes did not line up with the standard Rostock platform and that it seemed to use M2.5 hardware instead of the M3 indicated in the instructions.
This version has been updated to use the dimensions for the standard Rostock platform, M3 hardware, some minor tweaks to make it more printable, and updated the code to make it customizable.
The STLs that have been generated are for the standard Rostock platform and 1/8" NPT (or BSP) pneumatic fittings.
Also, please note, this version is not compatible with the original design.
After some use, I've found that this mount was unnecessarily complicated, made wiring difficult, and reduced the overall printable height. Please see my simplified and improved design here: http://www.thingiverse.com/thing:253859.