Just finished my cooling ring for the V9 Hotend (Mendel-Parts) of my Orca v0.30.
Some minor changes are still necessary and i even didn`t test it by myself XD
NEW VERSION UPLOADED !!!!
The lower part can be printed "as is".
Do NOT slice the lower part with Slic3r ! it will not work, use Skeinforge !
The upper part should be redesigned to fit a fan of your choice.
NEW VERSION UPLOADED !!!!
Now with bigger holes at the bottom and one mm higher Ring.
also made a comparison picture of printing the top part one time without and with cooling (printed at 30mm/s).