kinda hard to print this at 30 cm without having issues with the print and the center being square. over hang and all that.
try printing it with it's head down and the hole up, upside down? :)
i've had 2 unsuccessful attempts at printing this lamp on a replicator2, i asked markelov for a version with a cylinder on the inside but no word from him, as this would facilitate printing on it's side at 27cm tall (on a rep2)