extended leg for F450 size quadcopter

I had been looking for extended legs for an F450 qudcopter clone. I was converting it for aerial photography and need room underneath for a camera gimbal. Originally I printed the legs by lijbotero at this link - http://www.thingiverse.com/make:237142

These were great but I needed taller so I modified them to make them longer but the problem then were they were quite flimsy. Unfortunatly one of the legs broke on the second flight so I decided to design my own using lijbotero's design for insp