colorfabb nGen, ended up printing 5C lower than recommended to get rid of stringy bits. Link to file: http://www.thingiverse.com/thing:437576 If you are printing for good old sterling you need it to be at least 125% sized, the 100% sized just about works if you dont want £2/£1/£0.50p in there! Now have a queue of people requesting these....
The rate it is going with people asking for a copy of this I might get through the whole spool haha :-D